Question

I have gridview binded from database..

I have following code:

 protected void Page_Load(object sender, EventArgs e)
    {
        BindGrid();
    }

Now, I have checkBox and drop-down inside the gridView, When user selects some rows from checkboxes and clicks on Update Button, Page_Load event fires and calls BindGrid(); method and selected rows should get hidden.

How can I retain checkbox values after the page load event.

I don’t want to use IsPostBack property in Page load because I have used Paging.

How can I solve my problem?

Answer 1

You should only DataBind the GridView if(!Page.IsPostback). Otherwise no events are triggered and ViewState values(like SelectedIndex etc.) are overwritten from the DataSource values.

http://msdn.microsoft.com/en-us/library/system.web.ui.page.ispostback%28v=VS.100%29.aspx

if(!IsPostBack)
{
   BindGrid();
}

You also should call BindGrid from following event-handlers:

• PageIndexChanging
• SelectedIndexChanged
• Sorting