You would have to use the given EventArgument Property to determine which Key was pressed.
like this
private void objectXY_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
{
if(e.KeyChar == (char)Keys.Enter && Form.ModifierKeys == Forms.Keys.Control)
{ }
}
or this (depends on which .NET Version you work)
private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
{
if( e.KeyCode == Keys.Enter && e.Modifiers == Keys.Control)
{ }
}
This one is to handle multiple modifiers.
private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
{
if( e.KeyCode == Keys.Enter && e.Modifiers == (Keys.Control || Keys.Shift)
{ }
}