delete multiple row in gridview in checkbox

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C#

ASP.NET

how to delete multiple rows in gridview with checkbox selection and with confirmation using asp.net



this code give an error and i cannot find the Exception:-

the exception is:-(Object reference not set to an instance of an object.)

The C# sharp code is :-

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;

public partial class Default3 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        foreach (GridViewRow gv in GridView1.Rows)
        {
            CheckBox arun = (CheckBox)gv.FindControl("arun");
            if (arun.Checked==true)
            {
                int res = Convert.ToInt32(GridView1.DataKeys[gv.RowIndex].Value);
                SqlDataSource1.DeleteParameters["userid"].DefaultValue = res.ToString();

                SqlDataSource1.Delete();

            }
        }
    }
}