Form_Load event problem

[C# Programming]

Within my Form I am using

this.Load += new System.EventHandler(this.ItemForm_Load);

private void ItemForm_Load(object sender, EventArgs e)
{
myDataSet.Merge(mainForm.newDataSet);
}

However, the merge does not take place. Placing a breakpoint in the debugger shows that the ItemForm_Load never gets hit.

Any pointers would be much appreciated.