Gridview_RowDataBound中的错误 [英] Error in Gridview_RowDataBound

问题描述

This is my gridview row bound code

Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound

If e.Row.RowType = DataControlRowType.DataRow Then
Dim lcl_date As String = "d-MMM-yyyy"
If Session("lcl_date") IsNot Nothing Then
lcl_date = Session("lcl_date")
End If
Dim podate As DateTime = DataBinder.Eval(e.Row.DataItem, "podate")
Dim lbl5 As Label = CType(e.Row.FindControl("Label5"), Label)
Dim txpodate As TextBox = CType(e.Row.FindControl("txt_podate"), TextBox)
lbl5.Text = podate.ToString(lcl_date)
txpodate.text = podate.ToString(lcl_date)
End If

End Sub

It was working fine if i do not add

Dim txtpodate as textbox and txtpodate.text

and corresponding asp.net code is as

<asp:TemplateField HeaderText="PO Date">

                               <ItemTemplate>
                                   <asp:Label ID="Label5" runat="server" Text='<%# Bind("podate") %>'></asp:Label>
                               </ItemTemplate>
                               <EditItemTemplate>
                                   <asp:TextBox ID="txt_podate" runat="server" Text='<%# Bind("podate") %>'></asp:TextBox>
                               </EditItemTemplate>
                           </asp:TemplateField>
but after adding this line in the gridview row databound, it displaying error as Object reference not set to instance of the object

推荐答案

错误即将发生，因为您从获取控件EditItemTemplate 。

您可以从EditItemTemplate中找到Control，如下所示。

Error is coming because you are fetching control from EditItemTemplate.
You can find Control from EditItemTemplate as below.

If ((e.Row.RowState & DataControlRowState.Edit)) Then  
  Dim txpodate As TextBox = CType(e.Row.FindControl("txt_podate"), TextBox)
  Response.Write(TextBox1.Text)
End If  

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