Clearing DataSet doesn't work after closing and loading form

Hello everyone! So I'm using visual studio 2010. Created and filled with data a local database (SQL server compact 3.5). When I load form, on my DGV I can do whatever I want - delete, add, edit rows, then save changes.

I made a button to remove these changes and reset DataSet:

Code:

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Private Sub APPToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles APPToolStripMenuItem.Click

        SarasasDataSet.Clear()

        Me.SarasasDataSet.AcceptChanges()
        Me.Validate()
        Me.KandidataiBindingSource.EndEdit()
        Me.Close()

    End Sub

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The problem is this: I edit DGV and close a form (after saving). Then load form again (changes a left - it's ok), but when I try to clear DataSet in order to load my original DataTable on DGV - it clears, but DataSet after loading form DGV doesn't show original DataTable, but shows changed data . I can make it only when manually refreshing connection with database at server explorer window and loading form after.