ASP.NET

protected void Page_Load(object sender, EventArgs e)
{
    dt = (DataTable)Session["data"];
    GridView1.DataSource = dt;
    GridView1.DataBind();
}

protected void BtnDelete_Click(object sender, EventArgs e)
{
    try
    {
        dt = (DataTable)Session["Cart"];
        dt.PrimaryKey = new DataColumn[] { dt.Columns["REF"] };

        CheckBox chkSelected = new CheckBox();
        foreach (GridViewRow rowItem in GridView1.Rows)
        {
            chkSelected = (CheckBox)rowItem.FindControl("chkSelection");
            //index = rowItem.RowIndex;

            if (chkSelected.Checked == true)
            {
                DataKey dk = GridView1.SelectedDataKey;
                string sCellProductID = rowItem.Cells[0].Text;
                DataRow dtRemoveMe = dt.Rows.Find(sCellProductID);
                if (dtRemoveMe != null)
                {
                    dt.Rows.Remove(dtRemoveMe);
                    dt.AcceptChanges();
                }
            }
        }
        Lblmsg.Text = "The items are successfully deleted!!";
        GridView1.DataSource = dt;
        GridView1.DataBind();
        Session["Cart"] = dt;
    }
    catch(Exception ee)
    {
        Lblmsg.Text = ee.Message;
    }

}

<asp:GridView ID="grd" runat="server" OnRowDataBound="grd_RowDataBound">   
  
    
  
<Columns>    
  
  
<asp:TemplateField HeaderText="names">   
  
    
  
  
<ItemTemplate>  
  
    
  
  
<asp:DropDownList ID="name" runat="server" OnSelectedIndexChanged="onSelectChangeddl"></asp:DropDownList>  
  
    
  
</ItemTemplate>  
  
    
  
</asp:TemplateField>  
  
    
  
<asp:TemplateField HeaderText="age">   
  
    
  
<ItemTemplate>  
  
    
  
<asp:DropDownList ID="age" runat="server" AutoPostBack="true">   
  
    
  
</asp:DropDownList>  
  
    
  
  
</ItemTemplate>  
  
    
  
</asp:TemplateField>  
  
</Columns>  
  
    
  
</asp:GridView>  

foreach (GridViewRow row in grd.Rows)   
{   
DropDownList ddl1 = (DropDownList)row.FindControl("name");   
DropDownList ddl = (DropDownList)row.FindControl("age");   
  
  
if (ddl.SelectedValue.ToString() != "---Select---")   
  
{   
  
}   
  
else  
  
    
  
{   
  
ddl.Items.Clear();   
  
}   
  
    
  
SqlCommand SPComm = new SqlCommand("someStoredProcedure", myConn);   
  
SPComm.CommandType = CommandType.StoredProcedure;   
  
SqlParameter param = SPComm.Parameters.Add("@something", SqlDbType.NVarChar, 50);   
  
param.Value = something;   
  
dr = SPComm.ExecuteReader();  //dr is sqlDataReader   
  
int i = 0;   
  
while (dr.Read())   
  
{   
  
ddl.Items.Insert(i, dr.GetString(0));   
  
}   
  
dr.Close();   
  
ddl.Items.Insert(0, "---Select---");   
  
}