Question

实际上我正在设计我的网页，因为我输入了书籍id和
Nameofthebook。键入然后单击该书可用的按钮是转到另一页然后不可用是显示错误消息是书不可用我的项目（库管理系统）Asp.net sql server如何验证页面以及如何设置验证控制以及如何设置验证控制代码...向我发送完整的详细信息

My code
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;


public partial class Bookcheck : System.Web.UI.Page
{
      public Int64 Sid;
    protected void Page_Load(object sender, EventArgs e)
    {
        string Id;
        Id = Request.QueryString.Get(0);

    if (!(IsPostBack == true))
    {
        if (Request.QueryString.Get(1) == "G")
        {
            Sid = Convert.ToInt64(Id);
            if (PopulatedRecord (Sid ) == false)
            {

            }
        }
    }
}
private Boolean PopulatedRecord(Int64 Id)
{
    DataSet DS;
    DS = new DataSet();
    SqlCommand cmd = new SqlCommand();
    SqlDataAdapter da = new SqlDataAdapter();
    SqlConnection Cnn = new SqlConnection();
    string connectionstring;
    connectionstring = @"Datasource=DEVI\SQLEXPRESS;Intial catalog=librarymanagement;Integrated Security=SSPI";
    Cnn.ConnectionString = connectionstring;
    if (Cnn.State != ConnectionState.Open)
        Cnn.Open();
    cmd.Connection = Cnn;
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.CommandText = "usbinsertdatainto";
    cmd.Parameters.Clear();
    cmd.Parameters.AddWithValue("@bookId",txtid );
    da.SelectCommand = cmd;
    try
    {
        da.Fill(DS);
    }
    catch (Exception ex)
    {
        throw new ApplicationException(
            "!!! An Error Occured While Update Record In Dtl_SecurityCapital_Upload." + ex.Message);
        lblerror.Visible = true;
        lblerror.Text = "!!! An Error Occured While " + ex.Message.ToString();
        return false;
    }
    if (DS.Tables[0].Rows.Count > 0)
    {
        txtid.Text = DS.Tables[0].Rows[0]["bookId"].ToString();
        txtnb.Text = DS.Tables[0].Rows[0]["Nameofthebook"].ToString();
    }
    cmd.Dispose();
    Cnn.Close();
    Cnn.Dispose();
    return true;
}


}
        protected void  Button2_Click(object sender, EventArgs e)
         {
        if(Page.IsValid )
        {
        Response.Redirect ("issueofbook.aspx?bookid="+txtid.Text  

                                             +"&Nameofthebook="+txtnb.Text);
          }
      }
    }      

                   Error
                               Line 59:             throw new ApplicationException(
                               Line 60:                 "!!! An Error Occured While  
                                                      Update                              

                               Record In Dtl_SecurityCapital_Upload." + ex.Message);
                                Line 61:             lblerror.Visible = true;
                                   Line 62:             lblerror.Text = "!!! An Error 
                                                Occured While " +                          
                                                             ex.Message.ToString();

第63行：返回false;

Answer 1

尊敬的，使用RequiredFieldValidator（ASP.NET control）检查TextBox是否为空。要么使用JavaScript检查Textbox是否为空

标记：

<asp:TextBox ID="txtNo" runat="server" />
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"  ErrorMessage="No Required " ControlToValidate="txtNo" />
<asp:TextBox ID="txtName" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ErrorMessage="Name Required " ControlToValidate="txtName" />
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />

按钮点击事件：

protected void Button1_Click(object sender, EventArgs e)
{
    if (Page.IsValid)
    {
        Response.Redirect("~/Newpage.aspx?no=" + txtNo.Text + "&name=" + txtName.Text); 
    }
}

Asp.net如何使用验证控制代码

1 个答案: