用户只能在列表中选择一次一项

Question

我有一个gridview，允许用户选择要计费的项目。现在我的问题是用户只能在一张帐单中选择两次相同的项目。

参考屏幕：

用户在此处可以选择列表中的重复项，但效果不好。

我的ASPX标记：

<asp:GridView ID="Gridview1" runat="server" CssClass="table table-bordered table-hover table-responsive" ShowFooter="True" AutoGenerateColumns="False" OnRowDataBound="gvRowDataBound" OnRowDeleting="Gridview1_RowDeleting1" EmptyDataText="Data Not Available">
   <Columns>
     <asp:CommandField ShowDeleteButton="true" ControlStyle-CssClass="btn btn-danger fa fa-trash" DeleteText="" HeaderText="Remove Items" />
       <asp:BoundField DataField="RowNumber" HeaderText="Sl. No." />
      <asp:TemplateField HeaderText="Item Name" ItemStyle-Wrap="false" HeaderStyle-Wrap="false">
       <ItemTemplate>
        <asp:DropDownList ID="drpItemname" runat="server" Width="200px" CssClass="form-control select2" OnSelectedIndexChanged="GetItemDetails" AutoPostBack="true"></asp:DropDownList>
       </ItemTemplate>
       <HeaderStyle Wrap="False" />
       <ItemStyle Wrap="False" />
      </asp:TemplateField>
      <asp:TemplateField HeaderText="HSN Code" Visible="false" ItemStyle-Wrap="false" HeaderStyle-Wrap="false">
        <ItemTemplate>
         <asp:TextBox ID="txthsn" runat="server" CssClass="form-control" Enabled="False"></asp:TextBox>
        </ItemTemplate>
      </asp:TemplateField>
      <asp:TemplateField HeaderText="Available Quantity" ItemStyle-Wrap="false" HeaderStyle-Wrap="false">
        <ItemTemplate>
          <asp:TextBox ID="txtQttyAvailable" runat="server" CssClass="form-control" Enabled="False"></asp:TextBox>
        </ItemTemplate>
      </asp:TemplateField>
      <asp:TemplateField HeaderText="Quantity" ItemStyle-Wrap="false" HeaderStyle-Wrap="false">
        <ItemTemplate>
         <asp:TextBox ID="txtQtty" runat="server" CssClass="form-control" OnTextChanged="CalculateTotal" AutoPostBack="true" Enabled="true"></asp:TextBox>
        </ItemTemplate>
     </asp:TemplateField>
     <asp:TemplateField HeaderText="Unit Price" ItemStyle-Wrap="false" HeaderStyle-Wrap="false">
       <ItemTemplate>
         <asp:TextBox ID="txtUnitPrice" runat="server" CssClass="form-control" Enabled="False"></asp:TextBox>
       </ItemTemplate>
     </asp:TemplateField>
     <asp:TemplateField HeaderText="Discount" ItemStyle-Wrap="false" HeaderStyle-Wrap="false">
       <ItemTemplate>
        <asp:TextBox ID="txtdisc" runat="server" CssClass="form-control" Enabled="False"></asp:TextBox>
     </ItemTemplate>
     </asp:TemplateField>
     <asp:TemplateField HeaderText="S.GST" ItemStyle-Wrap="false" HeaderStyle-Wrap="false">
       <ItemTemplate>
        <asp:TextBox ID="txtsgst" runat="server" CssClass="form-control" Enabled="False"></asp:TextBox>
       </ItemTemplate>
     </asp:TemplateField>
     <asp:TemplateField HeaderText="C.GST" ItemStyle-Wrap="false" HeaderStyle-Wrap="false">
      <ItemTemplate>
        <asp:TextBox ID="txtcgst" runat="server" CssClass="form-control" Enabled="False"></asp:TextBox>
          </ItemTemplate>
      </asp:TemplateField>
      <asp:TemplateField HeaderText="I.GST" ItemStyle-Wrap="false" HeaderStyle-Wrap="false">
        <ItemTemplate>
          <asp:TextBox ID="txtigst" runat="server" AutoPostBack="true" CssClass="form-control" Enabled="False"></asp:TextBox>
        </ItemTemplate>
      </asp:TemplateField>
      <asp:TemplateField HeaderText="Total Price" ConvertEmptyStringToNull="False" ItemStyle-Wrap="false" HeaderStyle-Wrap="false">
       <ItemTemplate>
        <asp:TextBox ID="txtTotalPrice" runat="server" CssClass="form-control" Enabled="False"></asp:TextBox>
      </ItemTemplate>
      <FooterStyle HorizontalAlign="Right" />
       <FooterTemplate>
        <asp:Button ID="ButtonAdd" runat="server" CssClass="btn btn-primary" Text="Add" OnClick="AddItem" CausesValidation="False" />
       </FooterTemplate>
     </asp:TemplateField>
   </Columns>
         </asp:GridView>

我的C＃代码背后：

    protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
        Mylogic();
        SetInitialRow();
        ce1.StartDate = DateTime.Now.AddDays(-60);
        ce1.SelectedDate = DateTime.Now.Date;
        BindGrid();  
    }
}
private void SetInitialRow()
{
    DataTable dt = new DataTable();
    DataRow dr = null;
    dt.Columns.Add(new DataColumn("RowNumber", typeof(string)));
    dt.Columns.Add(new DataColumn("Column1", typeof(string)));
    dt.Columns.Add(new DataColumn("Column2", typeof(string)));
    dt.Columns.Add(new DataColumn("Column3", typeof(string)));
    dt.Columns.Add(new DataColumn("Column4", typeof(string)));
    dt.Columns.Add(new DataColumn("Column5", typeof(string)));
    dt.Columns.Add(new DataColumn("Column6", typeof(string)));
    dt.Columns.Add(new DataColumn("Column7", typeof(string)));
    dt.Columns.Add(new DataColumn("Column8", typeof(string)));
    dt.Columns.Add(new DataColumn("Column9", typeof(string)));
    dt.Columns.Add(new DataColumn("Column10", typeof(string)));
    dr = dt.NewRow();
    dr["RowNumber"] = 1;
    dr["Column1"] = string.Empty;
    dr["Column2"] = string.Empty;
    dr["Column3"] = string.Empty;
    dr["Column4"] = string.Empty;
    dr["Column5"] = string.Empty;
    dr["Column6"] = string.Empty;
    dr["Column7"] = string.Empty;
    dr["Column8"] = string.Empty;
    dr["Column9"] = string.Empty;
    dr["Column10"] = string.Empty;
    dt.Rows.Add(dr);
    ViewState["CurrentTable"] = dt;
    Gridview1.DataSource = dt;
    Gridview1.DataBind();
}
protected void GetItemDetails(object sender, EventArgs e)
{
    DropDownList ddl = sender as DropDownList;
    foreach (GridViewRow row in Gridview1.Rows)
    {
        Control ctrl = row.FindControl("drpItemName") as DropDownList;
        if (ctrl != null)
        {
            DropDownList ddl1 = (DropDownList)ctrl;
            if (ddl.ClientID == ddl1.ClientID)
            {
                TextBox QttyAvailable = row.FindControl("txtQttyAvailable") as TextBox;
                TextBox UnitPrice = row.FindControl("txtUnitPrice") as TextBox;
                TextBox HsnCode = row.FindControl("txthsn") as TextBox;
                TextBox Discount = row.FindControl("txtdisc") as TextBox;
                TextBox SGST = row.FindControl("txtsgst") as TextBox;
                TextBox CGST = row.FindControl("txtcgst") as TextBox;
                TextBox IGST = row.FindControl("txtigst") as TextBox;                    
                SqlConnection conn = new SqlConnection(constring);
                conn.Open();
                string str = "select * from Stock where itemname='" + ddl1.SelectedItem.ToString() + "'";
                SqlCommand com = new SqlCommand(str, conn);
                SqlDataReader reader = com.ExecuteReader();
                while (reader.Read())
                {
                    UnitPrice.Text = reader["unitprice"].ToString();
                    QttyAvailable.Text = reader["qtty"].ToString();
                    HsnCode.Text = reader["hsn"].ToString();
                    Discount.Text = reader["disc"].ToString();
                    SGST.Text = reader["sgst"].ToString();
                    CGST.Text = reader["cgst"].ToString();
                    IGST.Text = reader["igst"].ToString();
                }
                reader.Close();
                conn.Close();
            }
        }
    }
}
protected void CalculateTotal(object sender, EventArgs e)
{
    TextBox txt = sender as TextBox;
    foreach (GridViewRow row in Gridview1.Rows)
    {
        TextBox lblQty = row.FindControl("txtQttyAvailable") as TextBox;
        TextBox lblReceiveQty = row.FindControl("txtQtty") as TextBox;            
        if (lblQty != null && lblReceiveQty != null)
        {
            int Qty = 0, ReceiveQty = 0;
            if (!string.IsNullOrEmpty(lblQty.Text))
            {
                Qty = int.Parse(lblQty.Text);
            }
            if (!string.IsNullOrEmpty(lblReceiveQty.Text))
            {
                ReceiveQty = int.Parse(lblReceiveQty.Text);
            }
            if (ReceiveQty > Qty)
            {
                ScriptManager.RegisterStartupScript(this, this.GetType(), "swal", "swal('Required quantity can not ne greater than available stock!', 'Royal Riders, Vijayapura', 'warning');", true);
                lblReceiveQty.Text = "";
                lblReceiveQty.Focus();
            }
            else if (Qty >= ReceiveQty)
            {
                TextBox AQtty = row.FindControl("txtQttyAvailable") as TextBox;
                TextBox QttyReq = row.FindControl("txtQtty") as TextBox;
                TextBox UnitPrice = row.FindControl("txtUnitPrice") as TextBox;
                TextBox TotPrice = row.FindControl("txtTotalPrice") as TextBox;
                TextBox DiscountPrice = row.FindControl("txtdisc") as TextBox;
                DropDownList ItemName = row.FindControl("drpItemname") as DropDownList;
                Control ctrl = row.FindControl("txtQtty") as TextBox;
                if (ctrl != null)
                {
                    TextBox txt1 = (TextBox)ctrl;
                    if (txt.ClientID == txt1.ClientID)
                    {
                        decimal totamt = Convert.ToDecimal(QttyReq.Text) * Convert.ToDecimal(UnitPrice.Text);
                        decimal discountrate = (totamt) - (totamt * Convert.ToDecimal(DiscountPrice.Text)) / 100;
                        TotPrice.Text = discountrate.ToString("#,0.00");
                    }
                }                    
            }
        }
    }        
}
public static decimal totalgst;
public static decimal totalnetamt;
public static Int32 InitialStock;
protected void gvRowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        DropDownList drpItemName = (e.Row.FindControl("drpItemName") as DropDownList);
        foreach (GridViewRow row2 in Gridview1.Rows)
        {
            TextBox txt = row2.FindControl("txtTotalPrice") as TextBox;
            txt.Text = "0";
        }
        drpItemName.DataSource = GetData("SELECT itemname FROM Stock where rem != '1'");
        drpItemName.DataTextField = "itemname";
        drpItemName.DataValueField = "itemname";
        drpItemName.DataBind();            
        drpItemName.Items.Insert(0, new ListItem("Please select"));
    }
}
private DataSet GetData(string query)
{
    SqlCommand cmd = new SqlCommand(query);
    using (SqlConnection con = new SqlConnection(constring))
    {
        using (SqlDataAdapter sda = new SqlDataAdapter())
        {
            cmd.Connection = con;
            sda.SelectCommand = cmd;
            using (DataSet ds = new DataSet())
            {
                sda.Fill(ds);
                return ds;
            }
        }
    }
}
private void AddNewRowToGrid()
{
    int rowIndex = 0;
    if (ViewState["CurrentTable"] != null)
    {
        DataTable dtCurrentTable = (DataTable)ViewState["CurrentTable"];
        DataRow drCurrentRow = null;
        if (dtCurrentTable.Rows.Count > 0)
        {
            for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
            {
                DropDownList box1 = (DropDownList)Gridview1.Rows[rowIndex].Cells[1].FindControl("drpItemName");
                TextBox box2 = (TextBox)Gridview1.Rows[rowIndex].Cells[2].FindControl("txthsn");
                TextBox box3 = (TextBox)Gridview1.Rows[rowIndex].Cells[3].FindControl("txtQttyAvailable");
                TextBox box4 = (TextBox)Gridview1.Rows[rowIndex].Cells[4].FindControl("txtQtty");
                TextBox box5 = (TextBox)Gridview1.Rows[rowIndex].Cells[5].FindControl("txtUnitPrice");
                TextBox box6 = (TextBox)Gridview1.Rows[rowIndex].Cells[6].FindControl("txtdisc");
                TextBox box7 = (TextBox)Gridview1.Rows[rowIndex].Cells[7].FindControl("txtsgst");
                TextBox box8 = (TextBox)Gridview1.Rows[rowIndex].Cells[8].FindControl("txtcgst");
                TextBox box9 = (TextBox)Gridview1.Rows[rowIndex].Cells[9].FindControl("txtigst");
                TextBox box10 = (TextBox)Gridview1.Rows[rowIndex].Cells[10].FindControl("txtTotalPrice");
                drCurrentRow = dtCurrentTable.NewRow();
                drCurrentRow["RowNumber"] = i + 1;
                dtCurrentTable.Rows[i - 1]["Column1"] = box1.Text;
                dtCurrentTable.Rows[i - 1]["Column2"] = box2.Text;
                dtCurrentTable.Rows[i - 1]["Column3"] = box3.Text;
                dtCurrentTable.Rows[i - 1]["Column4"] = box4.Text;
                dtCurrentTable.Rows[i - 1]["Column5"] = box5.Text;
                dtCurrentTable.Rows[i - 1]["Column6"] = box6.Text;
                dtCurrentTable.Rows[i - 1]["Column7"] = box7.Text;
                dtCurrentTable.Rows[i - 1]["Column8"] = box8.Text;
                dtCurrentTable.Rows[i - 1]["Column9"] = box9.Text;
                dtCurrentTable.Rows[i - 1]["Column10"] = box10.Text;
                rowIndex++;
            }
            dtCurrentTable.Rows.Add(drCurrentRow);
            ViewState["CurrentTable"] = dtCurrentTable;
            Gridview1.DataSource = dtCurrentTable;
            Gridview1.DataBind();
        }
    }
    else
    {
        Response.Write("ViewState is null");
    }
    SetPreviousData();
}
private void SetPreviousData()
{
    int rowIndex = 0;
    if (ViewState["CurrentTable"] != null)
    {
        DataTable dt = (DataTable)ViewState["CurrentTable"];
        if (dt.Rows.Count > 0)
        {
            for (int i = 0; i < dt.Rows.Count; i++)

            {
                DropDownList box1 = (DropDownList)Gridview1.Rows[rowIndex].Cells[1].FindControl("drpItemName");
                TextBox box2 = (TextBox)Gridview1.Rows[rowIndex].Cells[2].FindControl("txthsn");
                TextBox box3 = (TextBox)Gridview1.Rows[rowIndex].Cells[3].FindControl("txtQttyAvailable");
                TextBox box4 = (TextBox)Gridview1.Rows[rowIndex].Cells[4].FindControl("txtQtty");
                TextBox box5 = (TextBox)Gridview1.Rows[rowIndex].Cells[5].FindControl("txtUnitPrice");
                TextBox box6 = (TextBox)Gridview1.Rows[rowIndex].Cells[6].FindControl("txtdisc");
                TextBox box7 = (TextBox)Gridview1.Rows[rowIndex].Cells[7].FindControl("txtsgst");
                TextBox box8 = (TextBox)Gridview1.Rows[rowIndex].Cells[8].FindControl("txtcgst");
                TextBox box9 = (TextBox)Gridview1.Rows[rowIndex].Cells[9].FindControl("txtigst");
                TextBox box10 = (TextBox)Gridview1.Rows[rowIndex].Cells[10].FindControl("txtTotalPrice");
                box1.Text = dt.Rows[i]["Column1"].ToString();
                box2.Text = dt.Rows[i]["Column2"].ToString();
                box3.Text = dt.Rows[i]["Column3"].ToString();
                box4.Text = dt.Rows[i]["Column4"].ToString();
                box5.Text = dt.Rows[i]["Column5"].ToString();
                box6.Text = dt.Rows[i]["Column6"].ToString();
                box7.Text = dt.Rows[i]["Column7"].ToString();
                box8.Text = dt.Rows[i]["Column8"].ToString();
                box9.Text = dt.Rows[i]["Column9"].ToString();
                box10.Text = dt.Rows[i]["Column10"].ToString();
                rowIndex++;
                if (!string.IsNullOrEmpty(box10.Text) && !string.IsNullOrEmpty(box10.Text))
                {
                    box10.Text = dt.Rows[i]["Column10"].ToString();
                }
                else
                {
                    box10.Text = "0";
                }
            }
        }
    }
}
protected void Confirm(object sender, EventArgs e)
{
    decimal sum = 0;
    decimal grandgst = 0;
    try
    {
        foreach (GridViewRow g12 in Gridview1.Rows)
        {
            Control ctrl2 = g12.FindControl("txtigst") as TextBox;
            if (ctrl2 != null)
            {
                TextBox txt1 = (TextBox)ctrl2;
                TextBox cgst = g12.FindControl("txtcgst") as TextBox;
                TextBox sgst = g12.FindControl("txtsgst") as TextBox;
                TextBox igst = g12.FindControl("txtigst") as TextBox;
                TextBox linegst = g12.FindControl("txtTotalPrice") as TextBox;
                TextBox totamt = g12.FindControl("txtTotalPrice") as TextBox;
                sum += decimal.Parse(((TextBox)(g12.Cells[10].FindControl("txtTotalPrice"))).Text);
                decimal fcgst = Convert.ToDecimal(totamt.Text) * Convert.ToDecimal(cgst.Text) / 100;
                decimal fsgst = Convert.ToDecimal(totamt.Text) * Convert.ToDecimal(sgst.Text) / 100;
                decimal figst = Convert.ToDecimal(totamt.Text) * Convert.ToDecimal(igst.Text) / 100;
                decimal ftot = Convert.ToDecimal(totamt.Text);
                totalgst = fcgst + fsgst + figst;
                grandgst += totalgst;
                totalnetamt = grandgst + sum;
            }
        }
        lblGstTotal.Text = grandgst.ToString();
        lblGTotal.Text = sum.ToString();
        lblGrandTotal.Text = (sum + grandgst).ToString();
        foreach (GridViewRow g1 in Gridview1.Rows)
        {
            string ITEMNAME = (g1.FindControl("drpItemname") as DropDownList).Text;
            string HSN = (g1.FindControl("txthsn") as TextBox).Text;
            string QTY = (g1.FindControl("txtQtty") as TextBox).Text;
            string UP = (g1.FindControl("txtUnitPrice") as TextBox).Text;
            string DIS = (g1.FindControl("txtdisc") as TextBox).Text;
            string SGST = (g1.FindControl("txtsgst") as TextBox).Text;
            string CGST = (g1.FindControl("txtcgst") as TextBox).Text;
            string IGST = (g1.FindControl("txtigst") as TextBox).Text;
            string TOT = (g1.FindControl("txtTotalPrice") as TextBox).Text;
            string InsertQuery = "Insert into Sales(bno,cdate,ctime,name,mobileno,address,gstno,pan,description,hsn,qtty,rate,disc,sgst,cgst,igst,linetotal,netamt,totalgst,grsamt,status,rem) values(@bno,@cdate,@ctime, @name, @mobileno, @address, @gstno, @pan, @description, @hsn, @qtty, @rate, @disc, @sgst, @cgst,@igst,@linetotal,@netamt,@totalgst,@grsamt,'1','0')";
            using (SqlConnection con = new SqlConnection(constring))
            {
                con.Open();
                using (SqlCommand cmd = new SqlCommand(InsertQuery, con))
                {
                    cmd.Parameters.AddWithValue("@bno", Convert.ToInt64(lblBillNo.Text));
                    cmd.Parameters.AddWithValue("@cdate", txtBDate.Text.ToString());
                    cmd.Parameters.AddWithValue("@ctime", systemtime.ToString());
                    cmd.Parameters.AddWithValue("@name", txtcname.Text);
                    cmd.Parameters.AddWithValue("@mobileno", txtcmobile.Text);
                    cmd.Parameters.AddWithValue("@address", txtcaddress.Text);
                    cmd.Parameters.AddWithValue("@gstno", txtgst.Text);
                    cmd.Parameters.AddWithValue("@pan", txtcpan.Text);
                    cmd.Parameters.AddWithValue("@description", ITEMNAME);
                    cmd.Parameters.AddWithValue("@hsn", HSN);
                    cmd.Parameters.AddWithValue("@qtty", QTY);
                    cmd.Parameters.AddWithValue("@rate", Convert.ToDecimal(UP));
                    cmd.Parameters.AddWithValue("@disc", Convert.ToDecimal(DIS));
                    cmd.Parameters.AddWithValue("@sgst", Convert.ToDecimal(SGST));
                    cmd.Parameters.AddWithValue("@cgst", Convert.ToDecimal(CGST));
                    cmd.Parameters.AddWithValue("@igst", Convert.ToDecimal(IGST));
                    cmd.Parameters.AddWithValue("@linetotal", Convert.ToDecimal(TOT));
                    cmd.Parameters.AddWithValue("@grsamt", (lblGTotal.Text));
                    cmd.Parameters.AddWithValue("@totalgst", Convert.ToDecimal(lblGstTotal.Text));
                    cmd.Parameters.AddWithValue("@netamt", Convert.ToDecimal(lblGrandTotal.Text));
                    int i = cmd.ExecuteNonQuery();
                    if(i > 0)
                    {
                        DropDownList ItemName = g1.FindControl("drpItemname") as DropDownList;
                        TextBox ReqQtty = g1.FindControl("txtQtty") as TextBox;
                        using (SqlConnection DeductStockCon = new SqlConnection(constring))
                        {
                            string query = "update Stock set qtty=CAST(IsNULL(qtty, '0') as int) - '" + Convert.ToInt32(ReqQtty.Text) + "' where itemname='" + ItemName.SelectedItem.ToString() + "'";
                            DeductStockCon.Open();
                            using (SqlCommand DeductStockCmd = new SqlCommand(query, DeductStockCon))
                            {
                                int j = DeductStockCmd.ExecuteNonQuery();
                                if (j > 0)
                                {
                                    ScriptManager.RegisterStartupScript(this, this.GetType(), "swal", "swal('Items inserted successfully!', 'Royal Riders, Vijayapura', 'success');", true);                                        
                                }
                            }
                        }
                    }
                }
            }
        }
        LoadReceipt();
        Clear();
        Mylogic();
        SetInitialRow();
    }
    catch (Exception ex)
    {
        throw ex;
    }
}
private void Clear()
{
    txtcname.Text = "";
    txtcmobile.Text = "";
    txtcaddress.Text = "";
    txtcpan.Text = "";
    txtgst.Text = "";
    drpMode.SelectedValue = "--Select Payment Mode--";
}
private void Mylogic()
{
    using (SqlConnection con = new SqlConnection(constring))
    {
        con.Open();
        using (SqlCommand cmd = new SqlCommand("SELECT MAX(bno) + 1 as Billno FROM Sales", con))
            lblBillNo.Text = cmd.ExecuteScalar().ToString();
        con.Close();
    }
}
protected void AddItem(object sender, EventArgs e)
{
    try
    {
        AddNewRowToGrid();
        decimal sum = 0;
        foreach (GridViewRow row1 in Gridview1.Rows)
        {
            TextBox val1 = row1.FindControl("txtTotalPrice") as TextBox;
            if (!string.IsNullOrEmpty(val1.Text) && !string.IsNullOrEmpty(val1.Text))
            {
                sum += 0;
            }
            else
            {
                sum += decimal.Parse(((TextBox)(row1.Cells[10].FindControl("txtTotalPrice"))).Text);
            }
        }
        lblGTotal.Text = sum.ToString();
    }
    catch (Exception ex)
    {
        lblGTotal.Text = ex.Message.ToString();
    }
}
protected void Gridview1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
    int index = Convert.ToInt32(e.RowIndex);
    SetInitialRow();
    BindGrid();
}
protected void BindGrid()
{
    Gridview1.DataSource = ViewState["CurrentTable"] as DataTable;
    Gridview1.DataBind();
}
private void LoadReceipt()
{
    SqlConnection CN;
    string MyConnectionString = null;
    MyConnectionString = constring;
    CN = new SqlConnection(MyConnectionString);
    CN.Open();
    string SQL = null;
    SQL = "SELECT * FROM Sales where bno=(select max(bno) as 'Billno' from Sales)";
    SqlDataAdapter myDA = new SqlDataAdapter(SQL, CN);
    CN.Close();
    SalesDataset DS = new SalesDataset();
    myDA.Fill(DS, "Sales");
    ReportDocument myRPT = new ReportDocument();
    myRPT.Load(Server.MapPath("Reports/BillReciept.rpt"));
    myRPT.SetDataSource(DS);
    rptSales.ReportSource = myRPT;
    rptSales.SeparatePages = false;
}
protected void btnLastReport_Click(object sender, EventArgs e)
{
    LoadReceipt();
}
protected void LinkButton1_Click(object sender, EventArgs e)
{
    LinkButton lb = (LinkButton)sender;
    GridViewRow gvRow = (GridViewRow)lb.NamingContainer;
    int rowID = gvRow.RowIndex;
    if (ViewState["CurrentTable"] != null)
    {
        DataTable dt = (DataTable)ViewState["CurrentTable"];
        if (dt.Rows.Count > 1)
        {
            if (gvRow.RowIndex < dt.Rows.Count - 1)
            { 
                dt.Rows.Remove(dt.Rows[rowID]);
                ResetRowID(dt);
            }
        } 
        ViewState["CurrentTable"] = dt; 
        Gridview1.DataSource = dt;
        Gridview1.DataBind();
    } 
    SetPreviousData();
}
private void ResetRowID(DataTable dt)
{
    int rowNumber = 1;
    if (dt.Rows.Count > 0)
    {
        foreach (DataRow row in dt.Rows)
        {
            row[0] = rowNumber;
            rowNumber++;
        }
    }
}
protected void Gridview1_RowDeleting1(object sender, GridViewDeleteEventArgs e)
{

    DataTable dt = (DataTable)ViewState["CurrentTable"];
    dt.Rows.RemoveAt(e.RowIndex);
    Gridview1.DataSource = dt;
    Gridview1.DataBind();
    SetPreviousData();
    if(Gridview1.Rows.Count <= 1)
    {
        ScriptManager.RegisterStartupScript(this, this.GetType(), "swal", "swal('This is the only item in the list!', 'Royal Riders, Vijayapura', 'success');", true);
        SetInitialRow();
    }
}

Answer 1

您可以通过两种方式完成

1. 处理GetItemDetails()事件方法中的代码以进行foreach，并检查在drpItemname下拉列表中选择的名称是否与以前的{{1 }} gridview的下拉列表

2. 在方法drpItemname中，将数据绑定到AddNewRowToGrid()下拉菜单之前，从drpItemname中删除在上一个list下拉菜单中已经选择的那些值，然后进行绑定它并添加行[注意，这将解决歧义，因为如果用户更改了上一个列表的dropdownvalue，则会遇到问题]

这些想法有用吗？

Ex 1-

drpItemname