DataGridView with two ComboBox columns. The second ComboBox will be filled with data depending on the selected value from first ComboBox

Dim comm As New Common
    Private EditRow As Integer = -1
    Private Sub DataGridView1_EditingControlShowing(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewEditingControlShowingEventArgs) Handles DataGridView1.EditingControlShowing
        EditRow = DataGridView1.CurrentRow.Index
        If DataGridView1.CurrentCellAddress.X = 0 Then

            'Handle the event(s) of the control while we are editing.        
            Me.column0ComboBox = DirectCast(e.Control, ComboBox)
        End If
    End Sub
   
    Private Sub DataGridView1_CellEndEdit(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellEndEdit
        '            SendKeys.Send("{TAB}")
        Me.column0ComboBox = Nothing

    End Sub


   

    Private Sub GridMode_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim dstemp As New DataSet
        sqry = "sp_dtgLoad_tbitemmaster"
        SqlCom = New SqlCommand(sqry, mycon)
        SqlCom.CommandType = CommandType.StoredProcedure
        SqlCom.Parameters.Add("@code ", SqlDbType.BigInt).Value = 1
        SqlCom.Parameters.Add("@itemid", SqlDbType.BigInt).Value = 0
        AdpComm = New SqlDataAdapter(SqlCom)
        AdpComm.Fill(dstemp, "tbItemMasterHeader")
        DataGridView1.DataSource = dstemp.Tables("tbBranchMaster")



        Try
            Dim dstemp12 As New DataSet
            sqry = "sp_dtgLoad_tbitemmaster"
            SqlCom = New SqlCommand(sqry, mycon)
            SqlCom.CommandType = CommandType.StoredProcedure
            SqlCom.Parameters.Add("@code ", SqlDbType.BigInt).Value = 1
            SqlCom.Parameters.Add("@itemid", SqlDbType.BigInt).Value = 0
            AdpComm = New SqlDataAdapter(SqlCom)
            AdpComm.Fill(dstemp12, "tbBankMaster")
            Column1.ValueMember = "itemId"
            Column1.DisplayMember = "Itemname"
            'DataGridView1.Rows.Add(1)
            Column1.DataSource = dstemp12.Tables(0)
        Catch ex As Exception
            MsgBox(ex.Message)
        End Try
    End Sub
    '

    Private WithEvents column0ComboBox As ComboBox

    Private Sub column_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) Handles column0ComboBox.SelectedIndexChanged
        Dim dstemp As New DataSet

        sqry = "sp_binditemsize"
        SqlCom = New SqlCommand(sqry, mycon)
        SqlCom.CommandType = CommandType.StoredProcedure
        SqlCom.Parameters.Add("@code ", SqlDbType.BigInt).Value = 1
        SqlCom.Parameters.Add("@itemid", SqlDbType.BigInt).Value = column0ComboBox.SelectedValue
        AdpComm = New SqlDataAdapter(SqlCom)
        AdpComm.Fill(dstemp, "tbItemMasterHeader")
        DataGridView1.DataSource = dstemp.Tables("tbBranchMaster")

        Try

            Dim dstemp12 As New DataSet
            sqry = "sp_binditemsize"
            SqlCom = New SqlCommand(sqry, mycon)
            SqlCom.CommandType = CommandType.StoredProcedure
            SqlCom.Parameters.Add("@code ", SqlDbType.BigInt).Value = 1
            SqlCom.Parameters.Add("@itemid", SqlDbType.BigInt).Value = column0ComboBox.SelectedValue
            AdpComm = New SqlDataAdapter(SqlCom)
            AdpComm.Fill(dstemp12, "tbBankMaster")
            Column2.ValueMember = "itemsizeid"
            Column2.DisplayMember = "SizeName"
            Column2.DataSource = dstemp12.Tables(0)
            'DataGridView1.Rows(EditRow).Cells(1).Value = dstemp12.Tables(0).Columns(3)


        Catch ex As Exception
            MsgBox(ex.Message)

        End Try

    End Sub
    Private Sub DataGridView1_DataError(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewDataErrorEventArgs) Handles DataGridView1.DataError
        If (e.Context = (DataGridViewDataErrorContexts.Formatting Or DataGridViewDataErrorContexts.PreferredSize)) Then
            e.ThrowException = False
        End If
    End Sub