The grid that I’m using inherits the Infragistics.Web.UI.GridControls.WebDataGrid. The version of Infragistics is 2010 volume 3.

 I want to create an ITemplate for my inherited WebDataGrid which contains a button. I add a click event on this button and the button displays itself very well on the WebDataGrid. When I click on a button in the grid it generates a postback and that's where my issue begins.

I'd selected one row and clicked on the button but when I debug my codebehind during the postback it states: "Behaviors.Selection.SelectedRows" have a count of 0. It seems that when I click the button on my inherited WebDataGrid it looses the selected rows collection.

The template looks like this:

public class Cx_DatagridTemplateButton : ITemplate

{

    Button _oButton;

    /// <summary>

    ///     Delegate event method click

    /// </summary>

    public delegate void click();

    /// <summary>

    ///     This is the instance of the deligate method. These instance will run if we click on the button

    /// </summary>

    public click ClickEvent;

    /// <summary>

    ///     Wen a datarow is initialized

    /// </summary>

    /// <param name="container"></param>

    public virtual void InstantiateIn(Control container)

    {

        this._oButton = new Button();

        this._oButton.ID = "btnButton";

        this._oButton.Width = Unit.Percentage(100);

        this._oButton.Height = Unit.Percentage(100);

        this._oButton.Click += delegate(object dlgSender, EventArgs dlgE)

        {

            this.ClickEvent();

        };   

        container.Controls.Add(_oButton);

    }

}

With the following manner I add the button column to the WebDataGrid (when there is no postback):

Cx_DatagridTemplateButton template = new Cx_DatagridTemplateButton();

Infragistics.Web.UI.GridControls.TemplateDataField column = new Infragistics.Web.UI.GridControls.TemplateDataField();

column.Header.Text = "Button";

column.ItemTemplate = template;

column.Key = "tempCol";

column.Width = System.Web.UI.WebControls.Unit.Pixel(60);

this.Cx_Datagrid1.Columns.Add(column);

this.Cx_Datagrid1.DataBind();

template.ClickEvent += new Cx_DatagridTemplateButton.click(_Default_Click);

Session.Add("tempCol", template);

When there is a postback:

((Infragistics.Web.UI.GridControls.TemplateDataField)this.Cx_Datagrid1.Columns[0]).ItemTemplate = (Cx_DatagridTemplateButton)Session["tempCol"];

this.Cx_Datagrid1.DataBind();

The problem I  had before this issue was the fact that my button disappeared when the page had a postback. Therefore I enclosed the template in a session object to retrieve it again when the postback is handled.

The method I use for (_Default_Click) looks like: 

public void _Default_Click()

{

System.Diagnostics.Debug.WriteLine("Selected rows: " + Cx_Datagrid1.Behaviors.Selection.SelectedRows.Count);

}

When I debug this code, I get the total count of the selectedrows is 0.
If I put it in my page_load the selected rows are 0 also.

The strange thing is when I place a click event on a different control on my page which generates a postback then the code DOES display the selected rows as it should be.

How can I resolve this that I can use the ITemplate Button on my inherited WebDataGrid so I can access the selected rows on the codebehind (server) when a button is clicked.

Thanks for answering