How to use data grid view in another class

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VB

I want to update data grid view data from another class. I tried but some error is came.. Some one can help me how to do this....?

What I have tried:

'//This is another class

Public Class dataUpdate

private MyMainClassObj as Form1

public sub setGrid()
MyMainClassObj.DatagridView1.Rows(0).Cell(1).Value = "256"
end sub

End Class


'// In Main Class

Public Class Form1

private DataUpdateObj as dataUpdate


Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

DataUpdateObj .setGrid()


End Sub


End Class