第二次单击时会触发asp.net动态按钮

Question

我有2个应该更新数据库的按钮，当它更新页面时应该使用更新的信息进行回发，但是...现在它在数据库中更新好了，但页面没有更新直到第2个点击，之后的点击都没问题，直到我点击了anohter标签......一切都重复发生了......顺便说一下上下调用按钮，它们是在创建网格的模板中动态创建的

所以up_ down按钮是在page_load之后构建的，page_load函数调用loaddisplaygrid（或loaddynamicdisplaygrid），然后在loaddisplaygrid（或loaddynamicdisplaygrid）函数中构建构建按钮的模板

//page load
protected void Page_Load(object sender, EventArgs e)
{
    RadToolBarItem textbxItem = MainRadToolBar.Items.FindItemByText("textbox");
    RadTextBox displayName = (RadTextBox)textbxItem.FindControl("displayName");

    Session["UserID"] = getUserID();

    if (!Page.IsPostBack)
    {
        if (Profile.ShowFilter)
        {
            displayMenuBar.Style["display"] = "block";
            displayLineBreak.Style["display"] = "block";
        }
        else
        {
            displayMenuBar.Style["display"] = "none";
            displayLineBreak.Style["display"] = "none";
        }

        loadDisplay();
        loadTemplate(); 
        loadTabs();
        saveDefaultOneOffFilter();
        checkIfEmpty();

        RadTab tab = displayTabs.SelectedTab;
        Profile.CurrTemplate = Profile.DefaultTemplate;
        if (Profile.DefaultTemplate == dfltTempID) //new user
        {
            displayName.Text = User.Identity.Name + "_default";
            si_display_save_button_Click();
            setDefault();
            Profile.CurrTemplate = Profile.DefaultTemplate;
            updateStatsformat();
            Response.Redirect("Display.aspx");
        } 

        if (tab != null)
        {
            loadDisplayGrid(Profile.CurrTemplate);
            Session["SelectedTabID"] = tab.Text;
        }       

    }
    else
    {
        RadTab tab = displayTabs.SelectedTab;

        if (tab != null)
        {
            if (tab.Text == Session["SelectedTabID"].ToString())
            {
                //ScriptManager.RegisterStartupScript(this, typeof(Page), "Alert", "<script>alert('" + "a" + "');</script>", false);
                loadDynamicDisplayGrid(Profile.CurrTemplate);//needs to be different, special just for postback
            }
            else
            {
                loadDisplayGrid(Profile.CurrTemplate);
                Session["SelectedTabID"] = displayTabs.SelectedTab.Text;
            }
            //automatically saves when toolbar is not visible....
            if (!Profile.ShowFilter) { si_display_save_button_Click(); }
        }

    }
}

 /// <summary>
/// updates and loads the RadGrid for the Display page, depending on which Tab is selected
/// </summary>
private void loadDisplayGrid(int tmpid)
{
    short DType = Convert.ToInt16(displayTabs.SelectedTab.Value);
    GridBoundColumn column;
    GridColumn columnchkbx;
    GridButtonColumn columnUp;
    GridButtonColumn columnDown;
    GridTemplateColumn columntxtbx;
    DisplayGrid.DisplayGridDataTable DisplayGridDT = new DisplayGrid.DisplayGridDataTable();
    DisplayGridTableAdapters.DisplayGridTableAdapter DisplayGridTA = new DisplayGridTableAdapters.DisplayGridTableAdapter();

    //update statsformat for the user if necessary
    if (Profile.CurrTemplate != 0)
    {
        SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["testDB_ConnectionString"].ConnectionString);
        SqlCommand command = new SqlCommand("UpdateNewStat", conn);
        command.CommandType = CommandType.StoredProcedure;
        command.Parameters.Add("@userid", SqlDbType.UniqueIdentifier).Value = getUserID();
        command.Parameters.Add("@tempid", SqlDbType.SmallInt).Value = Profile.CurrTemplate;
        conn.Open();
        command.ExecuteNonQuery();
        conn.Close();
    }
    //ScriptManager.RegisterStartupScript(this, typeof(Page), "Alert", "<script>alert('" + Profile.CurrTemplate + "');</script>", false);
    if (Profile.DefaultTemplate != 0)
    {
        DisplayGridTA.FillBy(DisplayGridDT, DType, (short)tmpid);
    }
    if (DisplayGridDT.Rows.Count == 0)
    {
        DisplayGridTA.Fill(DisplayGridDT, getUserID(), DType);
    }

    StatsFormatGrid.Columns.Clear();
    //Stat IsDisplayed
    columnchkbx = new GridCheckBoxColumn();
    columnchkbx.HeaderText = "Displayed";
    columnchkbx.UniqueName = DisplayGridDT.Columns[2].ColumnName;
    StatsFormatGrid.Columns.Add(columnchkbx);
    //Stats Name
    column = new GridBoundColumn();
    column.HeaderText = "Stats Name";
    column.DataField = DisplayGridDT.Columns[0].ColumnName;
    column.UniqueName = DisplayGridDT.Columns[0].ColumnName;
    StatsFormatGrid.Columns.Add(column);

    //Invisible columns
    for (int i = 3; i <= 6; i++)
    {
        column = new GridBoundColumn();
        column.HeaderText = (i == 3) ? "StatsTable.Stats_id" : (i == 4) ? "StatsTable.StatsValue_Type" : (i == 5) ? "StatsTable.Stats_CHeader" : "StatsTable.Stats_Desc";
        column.DataField = DisplayGridDT.Columns[i].ColumnName;
        column.UniqueName = DisplayGridDT.Columns[i].ColumnName;
        column.Visible = false;
        StatsFormatGrid.Columns.Add(column);
    }

    //Dynamically created column - Stats Display Format
    columntxtbx = new GridTemplateColumn();

    columntxtbx.HeaderText = "Stats Display Format";
    columntxtbx.ItemTemplate = new MyTemplate(DisplayGridDT, getUserID(),Profile.CurrTemplate);

    StatsFormatGrid.Columns.Add(columntxtbx);
    /*
    columnArrow = new GridTemplateColumn();
    columnArrow.ItemTemplate = new ArrowTemplate(DisplayGridDT, getUserID(), Profile.CurrTemplate);
    StatsFormatGrid.Columns.Add(columnArrow);*/

    columnUp = new GridButtonColumn();
    columnUp.Text = "↑";
    columnUp.UniqueName = DisplayGridDT.Columns[2].ColumnName;
    StatsFormatGrid.Columns.Add(columnUp);

    columnDown = new GridButtonColumn();
    columnDown.Text = "↓";
    columnDown.UniqueName = DisplayGridDT.Columns[2].ColumnName;
    StatsFormatGrid.Columns.Add(columnDown);

    StatsFormatGrid.DataSource = DisplayGridDT;
    StatsFormatGrid.DataBind();

    foreach (GridDataItem item in StatsFormatGrid.Items) //sets the properties of IsDisplayed 
    {
        DataRowView row = (DataRowView)item.DataItem;
        CheckBox chkbx = (CheckBox)item["IsDisplayed"].Controls[0];
        chkbx.Enabled = true;
        chkbx.AutoPostBack = true;
        String value = row["IsDisplayed"].ToString();
        chkbx.Checked = (value == "True");
    }
}

/// <summary>
/// This is the template for GridTemplateColumn in the display page's grid
/// This represent the column DisplayString
/// Three different kinds of contents are used in each cell of the column depending on StatsValue_Type
/// </summary>
private class MyTemplate : ITemplate
{
    //protected RequiredFieldValidator validator1;
    //protected RangeValidator validator2;
    protected TextBox textBox;
    protected DropDownList ddList;
    protected Label txtlb;
    protected Button up;
    protected Button down;
    private DisplayGrid.DisplayGridDataTable MyDT = new DisplayGrid.DisplayGridDataTable();
    private DisplayGridTableAdapters.DisplayGridTableAdapter MyTA = new DisplayGridTableAdapters.DisplayGridTableAdapter();
    private Guid myUserID = new Guid();
    private int template;

    public MyTemplate(DisplayGrid.DisplayGridDataTable DGDT, Guid UserID,int tempid)
    {
        MyDT = DGDT;
        myUserID = UserID;
        template = tempid;
    }
    public void InstantiateIn(System.Web.UI.Control container)
    {

        //textBox = new TextBox();
        ddList = new DropDownList();
        txtlb = new Label();
        up = new Button();
        up.Text = "↑";
        down = new Button();
        down.Text = "↓";
        //textBox.ID = "templateColumnTextBox";
        ddList.ID = "templateColumnDDList";
        txtlb.ID = "txtLabel";
        up.ID = "up";
        down.ID = "down";
        //textBox.DataBinding += new EventHandler(textBox_DataBinding);
        ddList.DataBinding += new EventHandler(ddList_DataBinding);
        txtlb.DataBinding += new EventHandler(label_DataBinding);
        up.Click += new EventHandler(up_Click);
        down.Click += new EventHandler(down_Click);
        /*validator1 = new RequiredFieldValidator();
        validator1.ControlToValidate = "templateColumnTextBox";
        validator1.ErrorMessage = "*";
        validator1.Display = ValidatorDisplay.Dynamic;
        validator2 = new RangeValidator();
        validator2.ControlToValidate = "templateColumnTextBox";
        validator2.Type = ValidationDataType.Integer;
        validator2.MinimumValue = "0";
        validator2.MaximumValue = "12";
        validator2.ErrorMessage = "*0-12";
        validator2.Display = ValidatorDisplay.Dynamic;*/

        //container.Controls.Add(textBox);
        container.Controls.Add(ddList);
        container.Controls.Add(txtlb);
        container.Controls.Add(up);
        container.Controls.Add(down);

        //container.Controls.Add(validator1);
        //container.Controls.Add(validator2);
    }

    /// <summary>
    /// Generates the text boxes when StatsValue_Type is double or percentage
    /// Assigns the text and the style
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    /*protected void textBox_DataBinding(object sender, EventArgs e)
    {

        TextBox tBox = (TextBox)sender;

        GridDataItem container = (GridDataItem)tBox.NamingContainer;
        string displayStr = ((DataRowView)container.DataItem)[MyDT.Columns[1].ColumnName].ToString();
        string valType = ((DataRowView)container.DataItem)[MyDT.Columns[4].ColumnName].ToString();
        string rdm = ((DataRowView)container.DataItem)[MyDT.Columns[3].ColumnName].ToString();
        if (valType == "double" || valType == "percentage")
        {
            tBox.Text = displayStr.Remove(displayStr.IndexOf(" "));
            tBox.Font.Bold = true;
            tBox.Style["text-align"] = "center";
            tBox.Width = 70;
            tBox.AutoPostBack = true;
            //tBox.TextChanged += new EventHandler(DisplayTextBox_TextChanged);
        }
        else
        {
            tBox.Enabled = false;
            tBox.Visible = false;
        }
    }*/

    protected void up_Click(object sender, EventArgs e)
    {
        Button bt = (Button)sender;
        GridDataItem container = (GridDataItem)bt.NamingContainer;


        string displayStr = ((DataRowView)container.DataItem)[MyDT.Columns[1].ColumnName].ToString();
        string valType = ((DataRowView)container.DataItem)[MyDT.Columns[4].ColumnName].ToString();
        string rdm = ((DataRowView)container.DataItem)[MyDT.Columns[3].ColumnName].ToString();

        int num = Convert.ToInt32(displayStr.Substring(0, displayStr.IndexOf(' ')))+1;
        string updateDisplay = num.ToString() + " decimals";
        string updateVal = "{0:f" + num.ToString() + "}";
        short stats_id = Convert.ToInt16(rdm);
        if (num < 13 && num > -1)
        {
            MyTA.UpdateQuery(updateVal, updateDisplay, stats_id, (short)template);

        }
    }

    protected void down_Click(object sender, EventArgs e)
    {
        Button bt = (Button)sender;
        GridDataItem container = (GridDataItem)bt.NamingContainer;
        //ScriptManager.RegisterStartupScript(bt, typeof(Page), "Alert", "<script>alert('" + "a" + "');</script>", false);
        string displayStr = ((DataRowView)container.DataItem)[MyDT.Columns[1].ColumnName].ToString();
        string valType = ((DataRowView)container.DataItem)[MyDT.Columns[4].ColumnName].ToString();
        string rdm = ((DataRowView)container.DataItem)[MyDT.Columns[3].ColumnName].ToString();

        int num = Convert.ToInt32(displayStr.Substring(0, displayStr.IndexOf(' '))) -1;
        string updateDisplay = num.ToString() + " decimals";
        string updateVal = "{0:f" + num.ToString() + "}";
        short stats_id = Convert.ToInt16(rdm);
        if (num < 13 && num > -1)
        {
           MyTA.UpdateQuery(updateVal, updateDisplay, stats_id, (short)template);

        }
    }
    /// <summary>
    /// Generates the drop down lists when StatsValue_Type is Date
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void ddList_DataBinding(object sender, EventArgs e)
    {
        DropDownList dl = (DropDownList)sender;
        GridDataItem container = (GridDataItem)dl.NamingContainer;
        string displayStr = ((DataRowView)container.DataItem)[MyDT.Columns[1].ColumnName].ToString();
        string valType = ((DataRowView)container.DataItem)[MyDT.Columns[4].ColumnName].ToString();
        string rdm = ((DataRowView)container.DataItem)[MyDT.Columns[3].ColumnName].ToString();
        if (valType == "Date")
        {
            dl.Items.Add(new ListItem("MM-DD-YY", "{0:MM-dd-yy}"));
            dl.Items.Add(new ListItem("DD-MM-YY", "{0:dd-MM-yy}"));
            dl.Items.Add(new ListItem("DD-MMM-YYYY", "{0:dd-MMM-yyyy}"));
            dl.SelectedIndex = (displayStr == "MM-DD-YY") ? 0 : (displayStr == "DD-MM-YY") ? 1 : 2;
            dl.AutoPostBack = true;
            dl.SelectedIndexChanged += new EventHandler(DisplayDDList_IndexChanged);
            up.Visible = false;
            down.Visible=false;
        }
        /*else if (valType == "double" || valType == "percentage")
        {
            dl.Items.Add(new ListItem("1 decimals", "{0:f1}"));
            dl.Items.Add(new ListItem("2 decimals", "{0:f2}"));
            dl.Items.Add(new ListItem("3 decimals", "{0:f3}"));
            dl.Items.Add(new ListItem("4 decimals", "{0:f4}"));
            dl.Items.Add(new ListItem("5 decimals", "{0:f5}"));
            dl.Items.Add(new ListItem("6 decimals", "{0:f6}"));
            dl.Items.Add(new ListItem("7 decimals", "{0:f7}"));
            dl.Items.Add(new ListItem("8 decimals", "{0:f8}"));
            dl.Items.Add(new ListItem("9 decimals", "{0:f9}"));
            dl.Items.Add(new ListItem("10 decimals", "{0:f10}"));
            dl.Items.Add(new ListItem("11 decimals", "{0:f11}"));
            dl.Items.Add(new ListItem("12 decimals", "{0:f12}"));
            dl.SelectedIndex =Convert.ToInt32(displayStr.Substring(0, displayStr.IndexOf(' ')));
            dl.AutoPostBack = true;
            dl.SelectedIndexChanged += new EventHandler(DisplayDDList_IndexChanged);
        }*/
        else
        {
            dl.Enabled = false;
            dl.Visible = false;
        }
    }

    /// <summary>
    /// Generates the words " digits" after the textboxes when StatsValue_Type is double or percentage
    /// Generates the label with text of DisplayString when StatsValue_Type is bit
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void label_DataBinding(object sender, EventArgs e)
    {
        Label lbl = (Label)sender;
        GridDataItem container = (GridDataItem)lbl.NamingContainer;
        string displayStr = ((DataRowView)container.DataItem)[MyDT.Columns[1].ColumnName].ToString();
        string valType = ((DataRowView)container.DataItem)[MyDT.Columns[4].ColumnName].ToString();
        string rdm = ((DataRowView)container.DataItem)[MyDT.Columns[3].ColumnName].ToString();
        if (valType == "bit")
        {
            lbl.Text = displayStr;
            lbl.Font.Bold = true;
            up.Visible = false;
            down.Visible = false;
        }
        else if (valType == "double" || valType == "percentage") { 
            lbl.Text = displayStr;
            lbl.Font.Bold = true;

        }
        else { lbl.Text = ""; }
    }

    /// <summary>
    /// Handles the event when textbox is sumbitted
    /// inefficient at the moment because it is fired for every textbox every tab change
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    /*protected void DisplayTextBox_TextChanged(object sender, EventArgs e)
    {

        TextBox tb = (TextBox)sender;
        GridDataItem container = (GridDataItem)tb.NamingContainer;

        string textCur = ((TextBox)sender).Text + " decimals";
        string textOld = ((DataRowView)container.DataItem)[MyDT.Columns[1].ColumnName].ToString();
        string testing = ((DataRowView)container.DataItem)[MyDT.Columns[0].ColumnName].ToString();
        if (textCur != textOld)
        {
            int value = Convert.ToInt16(((TextBox)sender).Text);
            short stats_id = Convert.ToInt16(((DataRowView)container.DataItem)[MyDT.Columns[3].ColumnName].ToString());
            string format = "{0:f" + value.ToString() + "}";
            string text = value.ToString() + " decimals";
            ScriptManager.RegisterStartupScript(tb, typeof(Page), "Alert", "<script>alert('" + "a" + "');</script>", false);
            //MyTA.UpdateDisplayGrid(format, text, myUserID, stats_id);
            MyTA.UpdateQuery(format, text, stats_id, (short)template);
        }
    }*/


    /// <summary>
    /// Handles the event when dropdownlist selection changes
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void DisplayDDList_IndexChanged(object sender, EventArgs e)
    {
        string date = ((DropDownList)sender).SelectedItem.Text;
        string format = ((DropDownList)sender).SelectedItem.Value;
        DropDownList ddl = (DropDownList)sender;
        GridDataItem container = (GridDataItem)ddl.NamingContainer;
        short stats_id = Convert.ToInt16(((DataRowView)container.DataItem)[MyDT.Columns[3].ColumnName].ToString());

        //MyTA.UpdateDisplayGrid(format, date, myUserID, stats_id);
        MyTA.UpdateQuery(format, date, stats_id, (short)template);
    }

}

//this is called on postback
protected void loadDynamicDisplayGrid(int tmpid)
{
    ArrayList oldchkbxList = new ArrayList();
    short DType = Convert.ToInt16(displayTabs.SelectedTab.Value);
    GridBoundColumn column;
    GridColumn columnchkbx;
    GridTemplateColumn columntxtbx;
    GridButtonColumn columnUp;
    GridButtonColumn columnDown;
    //GridTemplateColumn columnArrow;
    DisplayGrid.DisplayGridDataTable DisplayGridDT = new DisplayGrid.DisplayGridDataTable();
    DisplayGridTableAdapters.DisplayGridTableAdapter DisplayGridTA = new DisplayGridTableAdapters.DisplayGridTableAdapter();

    //update statsformat for the user if necessary
    if (Profile.CurrTemplate != 0)
    {
        SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["testDB_ConnectionString"].ConnectionString);
        SqlCommand command = new SqlCommand("UpdateNewStat", conn);
        command.CommandType = CommandType.StoredProcedure;
        command.Parameters.Add("@userid", SqlDbType.UniqueIdentifier).Value = getUserID();
        command.Parameters.Add("@tempid", SqlDbType.SmallInt).Value = Profile.CurrTemplate;
        conn.Open();
        command.ExecuteNonQuery();
        conn.Close();
    }

    if (Profile.DefaultTemplate != 0)
    {
        DisplayGridTA.FillBy(DisplayGridDT, DType, (short)tmpid);
    }
    if (DisplayGridDT.Rows.Count == 0)
    {
        DisplayGridTA.Fill(DisplayGridDT, getUserID(), DType);
    }

    //save the old values of the IsDisplayed checkboxes before refresh
    foreach (GridDataItem item in StatsFormatGrid.Items)
    {
        CheckBox chkbx = (CheckBox)item["IsDisplayed"].Controls[0];
        oldchkbxList.Add(chkbx.Checked);
    }

    StatsFormatGrid.Columns.Clear();
    //Stat IsDisplayed
    columnchkbx = new GridCheckBoxColumn();
    columnchkbx.HeaderText = "Displayed";
    columnchkbx.UniqueName = DisplayGridDT.Columns[2].ColumnName;
    StatsFormatGrid.Columns.Add(columnchkbx);
    //Stats Name
    column = new GridBoundColumn();
    column.HeaderText = "Stats Name";
    column.DataField = DisplayGridDT.Columns[0].ColumnName;
    column.UniqueName = DisplayGridDT.Columns[0].ColumnName;
    StatsFormatGrid.Columns.Add(column);

    //Invisible columns
    for (int i = 3; i <= 6; i++)
    {
        column = new GridBoundColumn();
        column.HeaderText = (i == 3) ? "StatsTable.Stats_id" : (i == 4) ? "StatsTable.StatsValue_Type" : (i == 5) ? "StatsTable.Stats_CHeader" : "StatsTable.Stats_Desc";
        column.DataField = DisplayGridDT.Columns[i].ColumnName;
        column.UniqueName = DisplayGridDT.Columns[i].ColumnName;
        column.Visible = false;
        StatsFormatGrid.Columns.Add(column);
    }

    //Dynamically created column - Stats Display Format
    columntxtbx = new GridTemplateColumn();
    columntxtbx.HeaderText = "Stats Display Format";
    columntxtbx.ItemTemplate = new MyTemplate(DisplayGridDT, getUserID(),Profile.CurrTemplate);
    StatsFormatGrid.Columns.Add(columntxtbx);
    /*
    columnArrow = new GridTemplateColumn();
    columnArrow.ItemTemplate = new ArrowTemplate(DisplayGridDT, getUserID(), Profile.CurrTemplate);
    StatsFormatGrid.Columns.Add(columnArrow);*/

    columnUp = new GridButtonColumn();
    columnUp.Text = "↑";
    columnUp.UniqueName = DisplayGridDT.Columns[2].ColumnName;
    StatsFormatGrid.Columns.Add(columnUp);

    columnDown = new GridButtonColumn();
    columnDown.Text = "↓";
    columnDown.UniqueName = DisplayGridDT.Columns[2].ColumnName;
    StatsFormatGrid.Columns.Add(columnDown);

    StatsFormatGrid.DataSource = DisplayGridDT;
    StatsFormatGrid.DataBind();


    int itr = 0;
    foreach (GridDataItem item in StatsFormatGrid.Items) //sets the properties of IsDisplayed 
    {
        CheckBox chkbx = (CheckBox)item["IsDisplayed"].Controls[0];
        chkbx.Enabled = true;
        chkbx.AutoPostBack = true;
        chkbx.Checked = (Boolean)oldchkbxList[itr];

        DataRowView row = (DataRowView)item.DataItem;
        String value = row["IsDisplayed"].ToString();
        if (value == "True" && !(Boolean)oldchkbxList[itr])
        {
            DisplayedCheckbox_CheckedChanged(chkbx, DisplayGridDT);
        }
        else if (value != "True" && (Boolean)oldchkbxList[itr])
        {
            DisplayedCheckbox_CheckedChanged(chkbx, DisplayGridDT);
        }
        itr++;
    }
}

//this is html
<telerik:RadGrid ID="StatsFormatGrid" runat="server" AutoGenerateColumns="False" GridLines="None"
                OnDataBound="grid_data_bound" EnableAJAX="true">
                <%--ClientSettings>
                    <Selecting AllowRowSelect="True"></Selecting>
                </ClientSettings--%>
            </telerik:RadGrid>

Answer 1

我相信你遇到了数据绑定和ASP.net Page life cycle的常见问题。简单地说：首先对数据进行数据绑定，然后进行更改。 Page_Load事件处理程序绑定您的数据，之后按下按钮并更改数据库。但是，该控件已绑定到先前版本的数据并显示旧信息。

您应该对控件进行数据绑定 AFTER 已按下按钮，并且已处理数据库中的更改。尝试将数据绑定代码放在Page_PreRender事件处理程序中。

Answer 2

您可以添加

Response.Redirect(Request.RawUrl);

在按钮点击事件中完成数据库更新后。

或者调用在页面中初始化数据的函数。例如

private void Page_Load(...)
{
    if(!Page.IsPostBack)
    {
        InitData();
    }
}

private void InitData()
{
    //Do init data control in your page
    // For exp: binding the grid, combo box....
}

protected void btn_Update_Clicked(...)
{
    //1. Update database
    //2. Call InitData() function to reload data from database
}