Delete Row from Data Grid

Posted on 2010-09-20
Last Modified: 2012-06-22
I need to be able to delete rows from a data grid, however if I add any columns and buttons to the form it throws up errors. (Sample code and errors attached.)

<%@ Page Language="C#" src="SearchUser.aspx.cs" AutoEventWireup="true" Inherits="Article15.SDisplay" ContentType="text/html" ResponseEncoding="iso-8859-1" %>
 <form id="Form1" method="post" runat="server">
		 <asp:GridView ID="GridView1" runat="server" BackColor="#dddddd"
            BorderColor="black" BorderStyle="Solid" Width="1200px" BorderWidth="5px" DataKeyNames="uid"
             EmptyDataText="Empty..." Font-Names="Verdana"
            Font-Size="Small" GridLines="None">
namespace Article15
  using System;
  using System.Collections;
  using System.ComponentModel;
  using System.Data;
  using System.Data.SqlClient;  
  using System.Web;
  using System.Web.SessionState;
  using System.Web.UI;
  using System.Web.UI.WebControls;
  using System.Web.UI.HtmlControls;
  using System.Web.UI.WebControls.WebParts;
  using System.Configuration;

  public class SDisplay : System.Web.UI.Page
	protected void Page_Load(Object s, EventArgs e)

	public void SQLFunction() 
		SqlConnection myConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["CONNECTSTR"].ConnectionString);
		SqlCommand oCom = new SqlCommand();
		oCom.Connection = myConnection;
		oCom.CommandText = "dbo247722972.sp_UserSearch";
		oCom.CommandType = CommandType.StoredProcedure;
		new SqlParameter("@surname", "Smith"));

    		SqlDataAdapter adapter = new SqlDataAdapter(oCom);
            	DataSet ds = new DataSet();

            	adapter.Fill(ds, "sqltable");

            	GridView1.DataSource = ds;


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Parser Error Message: System.Web.UI.WebControls.DataControlFieldCollection must have items of type 'System.Web.UI.WebControls.DataControlField'. 'asp:ButtonColumn' is of type 'System.Web.UI.WebControls.ButtonColumn'.

Source Error: 

Line 27: 			<columns>
Line 28: 			<asp:ButtonColumn Text="Delete" CommandName="Delete"  ButtonType="pushButton" />
Line 29: 			</columns>
Line 30: 	        </asp:GridView>

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Question by:kirkheaton25
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LVL 35

Expert Comment

ID: 33717414
use this
<asp:GridView ID="GridView3" runat="server" BackColor="#dddddd"
            BorderColor="black" BorderStyle="Solid" Width="1200px" BorderWidth="5px" DataKeyNames="uid"
             EmptyDataText="Empty..." Font-Names="Verdana"
            Font-Size="Small" GridLines="None">
            <asp:CommandField ShowEditButton="True" ShowDeleteButton="True" />

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Expert Comment

ID: 33717428
I think the button type is error,please remove the button type.
<asp:ButtonColumn   HeaderText="Delete" Text= "Del"     CommandName= "Delete" ></asp:ButtonColumn>
LVL 41

Expert Comment

ID: 33717462
you should add ButtonField like this:
 <asp:ButtonField Text="Delete" CommandName="Delete" ButtonType="Button" />

You can also set GV property AutoGenerateDeleteButton="true if you don't want to do above.
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LVL 35

Expert Comment

ID: 33717493
LVL 35

Accepted Solution

YZlat earned 500 total points
ID: 33717504

Author Comment

ID: 33717912
Thanks, I added:
<asp:commandfield showdeletebutton="true"
and added the OnRowDeleting="Documents_Delete" to the grid but I am now getting "fired event RowDeleting which wasn't handled." errors whenever I click on a Remove link.

The code behind is below.

      protected void Documents_Delete(object sender, GridViewDeleteEventArgs e)
       // Do something


Author Closing Comment

ID: 33717933
Thanks for your help. I've now got it working.

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