GridView contents don’t update when underlying data changes

Question

So I have an ASP.NET page with two controls:

• a GridView which displays rows from a SqlDataSource, and in which the user can select a row;

Answer 1

on page load:

YourGridViewID.DataBind()

Answer 2

If your OnItemUpdating event generates postback

protected void Page_Load(object sender, EventArgs e)
{
    if (IsPostBack)
    {
        GridView.DataBind();//rebinding it with considering changes DetailView
    }
}

If it doesn't work let me know.