ASP.NET

e.Row.Cells[cellIndex].ColumnSpan = your value;
// Code to delete n subsequent cells.

<div>
       UserName:
       <asp:TextBox ID="txtUserName" runat="server">
       </asp:TextBox>
       Password:
       <asp:TextBox ID="txtPassword" runat="server">
       </asp:TextBox>
       <asp:Button ID="login" OnClick="login_Click" Text="Login" runat="server" />
   </div>

protected void login_Click(object sender, EventArgs e)
   {
       Ektron.Cms.UserAPI userApi = new Ektron.Cms.UserAPI();
       if (!String.IsNullOrEmpty(txtUserName.Text) && !String.IsNullOrEmpty(txtPassword.Text))
       {
           UserData userInfo = userApi.logInUser(txtUserName.Text, txtPassword.Text, "");
           if (userInfo.Id > 0)
           {
               userApi.SetAuthenticationCookie(userInfo);
               Response.Redirect("/Cmslogin.aspx");
           }
       }
   }