one button and two separate events problem

Hi all,


I am trying to fire one event out of two avalible events based on a check box selectoin, I have already registered the two events in the page_load() and i check if the check box is checked (checkbox is located within a gridview) then i un-register one of the events and just keep one events registered as following(Only relative part is shown):
protected void Page_Load(object sender, EventArgs e) { Button_SessionStartOrEnd.Click += new EventHandler(this.Button_SessionStartOrEnd_Click_EndSession); Button_SessionStartOrEnd.Click += new EventHandler(this.Button_SessionStartOrEnd_Click_StartSession); } protected void GridView_SessionHistory_SelectedIndexChanged(object sender, EventArgs e) { Label_SessionLiveError.Text = ""; Label_SessionStartOrEnd.Text = ""; Panel_QuestionInfo.Vi ...