I am having trouble binding a combox that is populated "manually" just entering the values in the control's list. Population by BO and Enum is fine. Whenever I navigate, or change the combo value I get this....





Keith Chisarik

It has to do with your binding value within your data source...it has a NULL value.  Obviously you have data bound to the control...but your problem is in your population of the combo.  For example, if I wanted to populate a combo manually, I generally create an ADO.NET data table and bind it to the data source:

Dim loTable As New DataTable()

loTable.Columns.Add(New DataColumn("Display",GetType(String)))
loTable.Columns.Add(New DataColumn("Value",GetType(Integer)))

'-- Populate the table with your values

'-- Set the combo data source
MyCombo.DisplayMember = "Display"
MyCombo.ValueMember = "Value"
MyCombo.DataSource = loTable

You can obviously adjust the columns to the types and names that you want.  One other thing will be how you bind. By default, a StrataFrame combo looks at the Selectedvalue property for binding.  You can also adjust this by setting the BindingProperty of the combo to meet your needs.