Calendar Event click

Hi,
 As abhi explained you is correct & follow that, here is the code how u can do that :

1. Generate SelectionChanged event for Calendar :

  protected void Calendar1_SelectionChanged(object sender, EventArgs e)
        {
//here u can see i have called WebForm2 page & passed selected date
            ClientScript.RegisterStartupScript(GetType(), "Script", "");
        }

2. on WebForm2 page
   fetch selected date in page load :
    string date;
     protected void Page_Load(object sender, EventArgs e)
        {
            date = Request.QueryString["Date"];
           // now use this date to bind your data to grid
        }