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GridView: Delete multiple records using checkbox in asp.net 3.5

Through this article you will learn how to bind the record in gridview and how to delete their records on multiple checkbox select




Default.aspx:
<%@ Page Language="C#" AutoEventWireup="true"CodeFile="GridViewMutipleDeleteCheckBox.aspx.cs"
    Inherits="GridViewMutipleDeleteCheckBox" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script type="text/javascript" language="javascript">
        function ConfirmOnDelete(item)
        {
          if (confirm("Would you like to delete selected item(s)?")==true)
            return true;
          else
            return false;
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns=false
            onrowdatabound="GridView1_RowDataBound">
            <Columns>
                <asp:TemplateField>
                    <HeaderTemplate>
                        <asp:Button ID="ButtonDelete" runat="server" Text="Delete"OnClick=ButtonDelete_Click/>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <asp:CheckBox ID="CheckBox1" runat="server" />
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="EmpId" HeaderText="Emp Id"ReadOnly="True" />
                <asp:BoundField DataField="EmpName" HeaderText="Title" />
                <asp:BoundField DataField="Address" HeaderText="Emp Name" />
                <asp:BoundField DataField="Phone" HeaderText="Address" />
                <asp:BoundField DataField="Salary" HeaderText="Phone" />
                <asp:BoundField DataField="Country" HeaderText="Country" />
            </Columns>
        </asp:GridView>
    </div>
    </form>
</body>
</html>
Code behind:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Collections.Specialized;
using System.Text;

public partial class GridViewMutipleDeleteCheckBox : System.Web.UI.Page
{
    SqlConnection con = new SqlConnection();
    SqlCommand cmd = new SqlCommand();
    string connectionString = "Data Source=testserver;Initial Catalog=Testdatabase; uid=sa;pwd=wintellect";

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
            BindGridView();
    }
   
    private void BindGridView()
    {
        con = new SqlConnection(connectionString);
        cmd.Connection = con;
        cmd.CommandText = "Select * from Puru_test_Emp";
        con.Open();
        GridView1.DataSource = cmd.ExecuteReader();
        GridView1.DataBind();
        con.Close();
    }

    private void DeleteRecords(StringCollection sc)
    {
        con = new SqlConnection(connectionString);
        StringBuilder sb = new StringBuilder(string.Empty);
        foreach (string item in sc)
        {
            const string sqlStatement = "DELETE FROM Puru_test_Emp WHERE EmpId";
            sb.AppendFormat("{0}='{1}'; ", sqlStatement, item);
        }
        try
        {
            con.Open();
            SqlCommand cmd = new SqlCommand(sb.ToString(), con);
            cmd.CommandType = CommandType.Text;
            cmd.ExecuteNonQuery();
        }
        catch (System.Data.SqlClient.SqlException ex)
        {
            string msg = "Deletion Error:";
            msg += ex.Message;
            throw new Exception(msg);
        }
        finally
        {
            con.Close();
        }
    }
    protected void ButtonDelete_Click(object sender, EventArgs e)
    {
        StringCollection sc = new StringCollection();
        string id = string.Empty;
        for (int i = 0; i < GridView1.Rows.Count; i++)
        {
            CheckBox cb = (CheckBox)GridView1.Rows[i].Cells[0].FindControl("CheckBox1");
            if (cb != null)
            {
                if (cb.Checked)
                {
                    id = GridView1.Rows[i].Cells[1].Text;
                    sc.Add(id);
                }
            }
        }
        DeleteRecords(sc);
        BindGridView();
    }

    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.Header)
        {
            Button b = (Button)e.Row.FindControl("ButtonDelete");
            b.Attributes.Add("onclick""return ConfirmOnDelete();");
        }
    }
}
 
Ourput: Press f5 (Debug) and see the result as follows:

output.JPG

Suppose you want to delete last three records (Emp Id 5, 6, 7), first select records and click on delete button like as follows:

DeletCheck.JPG

After delete you will see the remaining result as follows:

record.JPG


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