I am getting the above error. I am maintaining chart information in a table and one of the columns is Chartype. In my form, I have the following code to display charttypes in the combobox. When I load the form or select a chart type, I get the error above. The column is not null and I have taken care of that in the BOMapper.

My combobox is bindingfield is configure to the ChartType column and businessobject is the BOChartsInventory1.

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Dim chartTypes As String() = System.Enum.GetNames(GetType(ChartType))

Dim ct As String

For Each ct In chartTypes

Me.cboChartype.Items.Add(ct)

Next ct

Me.cboChartype.SelectedValue = Me.cboChartype.Items(Me.cboChartype.FindString(System.Enum.GetName(GetType(ChartType), Me.chrtsMain.AreaChart.LineDrawStyle), 0))

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When binding a combo box to an enumeration, you have to have the bound field typed as that enumeration.  Meaning that if you have enum MyEnum, then the field on your BO should be customized so that it returns a MyEnum.  Then, the binding will work correctly.  So, if the column in the database is an integer type it will cast directly to the enum type, but if you want to store the data in a string column, you'll need to use custom code and put something like this:

Public Property MyField As MyEnum
    Get
        Return CType(Enum.Parse(GetType(MyEnum), CType(Me.CurrentRow("MyField"), String)), MyEnum)
    End Get
    Set(ByVal value As MyEnum)
        Me.CurrentRow("MyField") = value.ToString()
    End Set
End Property