Thanks for posting in the MSDN Forum.
As far as I know, you can use the Globals class. For instance, add a public void Sheet2Method() to the Sheet2, and you can call it in the Sheet1 class in accordance with the following code
public partial class Sheet1
private void Sheet1_Startup(object sender, System.EventArgs e)
private void Sheet1_Shutdown(object sender, System.EventArgs e)
Hope this can help you.
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