re-initializing id column of database table

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VB

can anybody tel me the code for re-initializing the id column from 1 again when the table is made empty.i am using sql express as my back end ...i tried this code:

 <pre lang="vb">Private Sub DataGridView1_CellContentClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellContentClick
        Dim i As Integer
        i = DataGridView1.CurrentRow.Index
        TxtId.Text = DataGridView1.Item(0, i).Value
        TxtUsername.Text = DataGridView1.Item(1, i).Value
        TxtPassword.Text = DataGridView1.Item(2, i).Value
        If DataGridView1.Item(0, 0).Value = vbEmpty Then
            DataGridView1.Item(0, 0).Value=initialize
End If</pre>