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    Question Datagridview giving errors on adding a new row on the comboboxcell

    Hello, I have problems with a comboboxcolumn in a datagridview: As I want to insert a new row, I get a "System.ArgumentException: The value of the DataGridViewComboBoxCell is invalid." I am using Linq to SQL to populate the data from different tables: - Table Customer (ID (key), Name,...) -...
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