Check these conditions
-------------------------
Condition 1 :
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
{
FirstLoad();
}
}
Private void FirstLoad(){
}
protected void ImgButton1_Click(object sender,EventArgs e)
{
}
protected void ImgButton2_Click(object sender,EventArgs e)
{
}
Condition 2 :
You need to check the OnClick Event of two Image Buttons, Some time You may provided the same event for two buttons