[2005] How to Click and Select a row for processing in DataGridview control

I have a couple of methods define to help User click to select a row of my datagridview . Problem is when I click a row in my grid, nothing happens, none of the events are fired when I only use one. However when I have all three events in my code, As soon as the page loads, one of the three fires even before user is able to click anything and runs into an error. Does anyone know the best way to handle this issue please??

Code:

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    Private Sub DataGridView1_CellContentClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellContentClick
        If LOADING = True Then
            'do nothing else
            LOADING = False
            Return
        Else
            ' Show the customer order screen when the user presses Enter except for
            ' where the Customer ID is not yet known (such as the New Row).
            Me.ProductionID = CInt(DataGridView1.Rows(DataGridView1.CurrentCellAddress.Y).Cells("PRODUCTIONID").Value)
            Dim tca As Integer = CInt(DataGridView1.Rows(DataGridView1.CurrentCellAddress.Y).Cells("TCAPO").Value)
            Dim WPO As String = DataGridView1.Rows(DataGridView1.CurrentCellAddress.Y).Cells("WPO").Value
            'get the packedID associated with this from Packed Table
            getPackedID(tca, WPO)

            If CBool(Not Me.ProductionID) Then
                ' Stop the DataGridView from processing the enter.
                Dim co As ProductionData = New ProductionData
                co.ProductionID = Me.ProductionID
                co.packedID = Me.PACKEDID
                co.ShowDialog(Me)

            End If
        End If
    End Sub


    Private Sub DataGridView1_KeyDown1(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles DataGridView1.KeyDown

        ' Show the customer order screen when the user presses Enter except for
        ' where the Customer ID is not yet known (such as the New Row).
        If LOADING = True Then
            'do nothing else
            LOADING = False
            Return
        Else
            If e.KeyData = Keys.Enter Then

                Me.ProductionID = CInt(DataGridView1.Rows(DataGridView1.CurrentCellAddress.Y).Cells("ProductionID").Value)
                Dim tca As Integer = CInt(DataGridView1.Rows(DataGridView1.CurrentCellAddress.Y).Cells("TCAPO").Value)
                Dim WPO As String = DataGridView1.Rows(DataGridView1.CurrentCellAddress.Y).Cells("WPO").Value
                'get the packedID associated with this from Packed Table
                getPackedID(tca, WPO)

                If CBool(Not Me.ProductionID) Then
                    ' Stop the DataGridView from processing the enter.
                    e.Handled = True
                    Dim co As ProductionData = New ProductionData
                    co.ProductionID = Me.ProductionID
                    co.packedID = Me.PACKEDID
                    co.ShowDialog(Me)

                End If
            End If
        End If
        LOADING = True
    End Sub

    ' Detecting Which Cell Is Clicked
    '---when the user clicks on the datagridview control---
    Private Sub DataGridView1_CellEnter(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellEnter
        If LOADING = True Then
            'do nothing else
            LOADING = False
            Return
        Else

            '---prints the content of the cell---
            Dim x As Integer = e.RowIndex
            '    'get the ProductionID for this row
            Me.ProductionID = CInt(DataGridView1.Rows(e.RowIndex).Cells("ProductionID").Value)
            'get the packedID associated with this from Packed Table
            Dim tca As Integer = CInt(DataGridView1.Rows(e.RowIndex).Cells("TCAPO").Value)
            Dim WPO As String = DataGridView1.Rows(e.RowIndex).Cells("WPO").Value
            getPackedID(tca, WPO)

            Dim co As ProductionData = New ProductionData
            co.ProductionID = Me.ProductionID
            co.packedID = Me.PACKEDID
            co.ShowDialog(Me)

        End If
    End Sub

    Private Sub DataGridView1_SelectionChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DataGridView1.SelectionChanged
        Me.ProductionID = CInt(DataGridView1.Rows(DataGridView1.CurrentCellAddress.Y).Cells("ProductionID").Value)
        If LOADING = True Then
            'do nothing else
            LOADING = False
            Return
        Else
            If CBool(Not Me.ProductionID) Then
                ' Stop the DataGridView from processing the enter.
                ' Stop the DataGridView from processing the enter.
                Dim co As ProductionData = New ProductionData
                co.ProductionID = Me.ProductionID
                co.packedID = Me.PACKEDID
                co.ShowDialog(Me)
                Me.Close()
            End If
        End If
    End Sub

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thanks in advance

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