ASP.net populate extra column in GridView through button click

Hi.

I have a GridView on my ASP.net site that has an extra column containing buttons
and another containing labels. When I click the button in one row I have managed to populate the label column with text. The only problem is that when I click the next row it clears the label populated in the other one. I need to stop this from happening

Private Sub GridView2_RowCommand1(sender As Object, e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridView2.RowCommand
        Try
                Dim index As Integer = Convert.ToInt32(e.CommandArgument)
                ' Retrieve the row that contains the button 
                ' from the Rows collection.
                Dim row As GridViewRow = GridView2.Rows(index)
                row.Cells(0).Text = "Strongly Agree"

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