Gridview row deleting

<asp:gridview id="GridView1" runat="server" allowpaging="True" xmlns:asp="#unknown">
        AutoGenerateColumns="False" 
        DataSourceID="cmmentsdatasource" Width="992px" onrowcommand="rowcmd" 
        DataKeyNames='id' CellPadding="0" CssClass="style51" ForeColor="#333333">
        
        

        <rowstyle backcolor="#EFF3FB" font-bold="False" height="20px"></rowstyle>
        <columns>
        <asp:templatefield>
                 <itemtemplate>
                 <asp:linkbutton id="lb1" runat="server" causesvalidation="false" onclientclick="return confirm('Are You sure to delete this entry')" text="Delete" commandargument="<%#Eval("id")%>"></asp:linkbutton>
                 </itemtemplate>
                 
                 </asp:templatefield>
                
         <asp:boundfield datafield="id" headertext="ID" sortexpression="id" />
            <asp:boundfield datafield="senderid" headertext="SenderId">
                SortExpression="senderid" />
            <asp:boundfield datafield="sendername" headertext="SenderName">
                SortExpression="sendername" />
            <asp:boundfield datafield="comments" headertext="Comments">
                SortExpression="comments" />
            <asp:boundfield datafield="date" headertext="Date" sortexpression="date" />
        </asp:boundfield></asp:boundfield></asp:boundfield></columns>
       
        
        <footerstyle backcolor="#507CD1" font-bold="True" forecolor="White">
       </footerstyle>
       
        

        <pagerstyle backcolor="#2461BF" forecolor="White" horizontalalign="Center">
       </pagerstyle>
       

        <selectedrowstyle backcolor="#D1DDF1" font-bold="True" forecolor="#333333">
        </selectedrowstyle>
       
        

        <headerstyle backcolor="#507CD1" font-bold="True" forecolor="White">
            Font-Size="Small" Height="20px">
        </headerstyle>
       
        
        <editrowstyle backcolor="#2461BF"></editrowstyle>
        

        <alternatingrowstyle backcolor="White"></alternatingrowstyle>
    </asp:gridview>

protected void rowcmd(object sender, GridViewCommandEventArgs e)
    {
      // create and open DB connection
        try
        {
           
            Int32 id = Convert.ToInt32(e.CommandArgument);
            string comm = "Delete from tblComments where id=@id";
            SqlCommand cmd = new SqlCommand(comm, Db.GetConnection());
            cmd.Parameters.AddWithValue("id", id);
            cmd.ExecuteNonQuery();
           GridView1.DataBind();
        }
        catch (Exception ex)
        {
        }

    }