Hello Alexander,

I have changed  the code for the example in this way and it works fine.

    private void Page_Load(object sender, System.EventArgs e)
        {
            // If there is a query string, then this is a custom AJAX call, which means that the user has changed a
            // DropDownList selection from the Dropdown.

         if (!Page.IsPostBack){
           
            if (Request.QueryString.Count > 0)
            {
                // Filter the DataView
                applyFilterOnDataView();
                isFiltering = true;
            }

           }

        }

I think that you need to handle in your code this condition to recreate the headers when postback is made in UltraWebGrid1_InitializeDataSource1 method for reference see the  sample.

 else if (this.IsPostBack && !this.UltraWebGrid1.IsXmlHttpRequest)
            {
                // 1: Get the DataView from the session state
                DataView dv = (DataView)Session["GridDataSource"];

                // 2: Create templated columns for DropDownLists to show in each header
                createDropDownsForRowFiltering(dv);

                // Since we want the DropDownLists for the header template, we will create all columns in code
                this.UltraWebGrid1.DisplayLayout.AutoGenerateColumns = false;
            }

I hope this will help you.

Rado,

Developer support team

Infragistics

Add one additional question:

If I do data binding  in PreRender method my template controls loose their state.  Probably it is because state is restored from ViewState after Page_Load but before PreRender. Is anyway to load it by force?

void Page_Load()
{
InitColumns();
}

void Page_PreRender() //controls state is not restored

{

m_grid.DataSource = ds.Tables[0].DefaultView;
m_grid.DataBind();

}

Thanks, Rado!

I have investigated you sample, and faced with following problem:

I dynamically generate columns the same method as in you sample.

The problem is following:

When I do data binding each time all work fine, but if I do binding only on fist request InstantiateIn method did not rised and my column's headers all are empy.

void Page_Load() // Works fine
{
InitColumns();
m_grid.DataSource = ds.Tables[0].DefaultView;
m_grid.DataBind();
}

void Page_Load() //works only on first request
{
 InitColumns();
 If(!IsPostBack)
 {
  m_grid.DataSource = ds.Tables[0].DefaultView;
  m_grid.DataBind();
 }
}

I cannot (don't want) do data binding on each request.

How can I fix it?