John:
It looks like you are doing everything you need. Your code works for
me as long as I set the grid's DataSource property to a source of
records. Do you have data in the data source?
--
Scott
http://www.OdeToCode.com
On Wed, 31 Dec 2003 10:24:28 -0500, "John Ruiz"
<no_email@provided.com> wrote:
[color=blue]
>Greetings,
>
>I originally posted this to
>microsoft.public.dotnet.framework.aspnet.datagrid control two weeks ago, but
>no one was able to answer.
>
>I am unable to dynamically add columns to a DataGrid in a web user control
>(.ascx) I am creating. This applies to VS.NET 2003 / Framework 1.1.
>
>
>I looked through the Framework Documentation for
>System.Web.UI.WebControls.DataGridColumnCollectio n, and found the following
>text:
>
>"The DataGrid control does not store the contents of its Columns collection
>into the view state. To add or remove a column dynamically, you must
>programmatically add or remove the column everytime the page is refreshed.
>Provide a Page_Init function that adds or removes the column before the
>DataGrid control's state is reload and the control is rebuilt. Otherwise,
>the changes to the Columns collection are not reflected in the DataGrid
>control when it is displayed."
>
>
>Searching through the newsgroup on how I might go about achieving this, I
>found a link to the MSDN library that contained example code. Here is that
>link:
>
http://msdn.microsoft.com/library/de...us/dv_vstechar
>t/html/vbtchtopquestionsaboutaspnetdatagridservercontrol. asp
>
>
>I attempted to create a very simplistic test which follows the example given
>in the link above, but the DataGrid still does not show its columns. What
>follows are pertinent parts of the .aspx and .aspx.cs file in my test.
>Please - does anyone have an idea of what I am doing wrong?
>
>Thank you very much,
>John Ruiz
>
>--------------------- WebForm1.aspx ---------------------
><body MS_POSITIONING="GridLayout">
> <form id="Form1" method="post" runat="server">
>
> <asp:DataGrid id="mDataGrid" runat="server"
> AutoGenerateColumns="False">
> </asp:DataGrid>
>
> <br>
>
> <asp:Button id="Button1" runat="server"
> Text="Give Me Columns"></asp:Button>
>
> </form>
></body>
>
>
>--------------------- WebForm1.aspx.cs ---------------------
>
>
> public class WebForm1 : System.Web.UI.Page
> {
> protected System.Web.UI.WebControls.DataGrid mDataGrid;
> protected System.Web.UI.WebControls.Button Button1;
>
> private void Page_Load(object sender, System.EventArgs e)
> {
> }
>
> private bool DynamicColumnAdded
> {
> get
> {
> object b = ViewState["DynamicColumnAdded"];
> return (b == null) ? false : true;
> }
> set
> {
> ViewState["DynamicColumnAdded"] = value;
> }
> }
>
> protected override void LoadViewState(object savedState)
> {
> base.LoadViewState(savedState);
> if (DynamicColumnAdded)
> {
> this.AddColumns();
> }
> }
>
>
> private void AddColumns()
> {
> BoundColumn dgc_id = new BoundColumn();
> dgc_id.HeaderText = "ID";
> dgc_id.ItemStyle.Width = new Unit(80);
> mDataGrid.Columns.Add(dgc_id);
>
> BoundColumn dgc_title= new BoundColumn();
> dgc_title.HeaderText = "Title";
> mDataGrid.Columns.Add(dgc_title);
>
> mDataGrid.DataBind();
> this.DynamicColumnAdded = true;
> }
>
> private void Button1_Click(object sender, System.EventArgs e)
> {
> if(this.DynamicColumnAdded != true)
> {
> this.AddColumns();
> }
> }
>
> } // end class declaration
>
>[/color]
--
Scott
http://www.OdeToCode.com 
