how to convert for dev express controls

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ASP.NET4

i have using this function for the web-gui commponents

Shared Sub TextBox_LostFocus(ByRef pTextBox As TextBox, Optional ByVal NumDigitsAfterDecimal As Integer = 2, Optional ByVal err As ErrorProvider = Nothing)

        If Not err Is Nothing Then
            err.SetError(pTextBox, "")
        End If

        If pTextBox.Text.Trim.Length = 0 Then
            pTextBox.Text = 0
        End If

        Try
            pTextBox.Text = FormatNumber(pTextBox.Text, NumDigitsAfterDecimal)
            pTextBox.Tag = pTextBox.Text
        Catch ex As Exception
            If Not err Is Nothing Then
                err.SetError(pTextBox, "Incorrect Amount Format!")
            End If
        End Try

    End Sub

but i am not be able to use the same function for the dev-express controls

plz help me to convert this code for use my dev-express controls

already i had try this code

Shared Sub ASPxTextBox_LostFocus(ByRef pTextBox As DevExpress.Web.ASPxEditors.ASPxTextBox, Optional ByVal NumDigitsAfterDecimal As Integer = 2, Optional ByVal err As DevExpress.ExpressApp.Web.Templates.Controls.ErrorInfoControl = Nothing)

        If Not err Is Nothing Then
            err.Caption = ""
        End If

        If pTextBox.Text.Trim.Length = 0 Then
            pTextBox.Text = 0
        End If

        Try
            pTextBox.Text = FormatNumber(pTextBox.Text, NumDigitsAfterDecimal)
            'pTextBox.Tag = pTextBox.Text
        Catch ex As Exception
            If Not err Is Nothing Then
                err.Caption = "Incorrect Amount Format!"
            End If
        End Try

    End Sub

but it is not working.now plz help out me