In GridView i wanted to delete the row by using checkbox

  protected void btnDelete_Click(object sender, EventArgs e)

    {

        //Loop through all the rows in gridview

        foreach (GridViewRow GridViewrow in GridView1.Rows)

        {

            //Finiding checkbox control in gridview for particular row

            CheckBox chkdelete = (CheckBox)GridViewrow.FindControl("chkdelete");

            //Condition to check checkbox selected or not

            if (chkdelete.Checked)

            {

                //Getting UserId of particular row using datakey value

             int Sno = Convert.ToInt32(GridView1.DataKeys[GridViewrow.RowIndex].Value);

                SqlDataSource1.DeleteParameters["Sno"].DefaultValue =Sno.ToString();

                SqlDataSource1.Delete();

            }




when i wanted to execute this one getting this error:


Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index