Conversion From Type Dbnull To Type String Is Not Valid. The exception that is thrown when one of the arguments provided to a method is not valid ArgumentNullException 当将 null 引用（Visual Basic 中为 Nothing）传递到不接受其作为有效参数的方法时引发的异常。 The exception that is thrown when a null reference (Nothing in Visual Basic) is passed to a method that does not accept it as a valid argument.
The DBNull type is a singleton class which means only one DBNull object exists The DBNullValue member represents the sole DBNull object DBNullValue can be used to explicitly assign a nonexistent value to a database field although most ADONET data providers automatically assign values of DBNull when a field does not have a valid value.
handling dbnull data in vb.net Stack Overflow
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System 命名空间 Microsoft Docs
DBNull Class (System) Microsoft Docs
I want to generate some formatted output of data retrieved from an MSAccess database and stored in a DataTable object/variable myDataTable However some of the fields in myDataTable cotain dbNull data So the following VBnet code snippet will give errors if the value of any of the fields lastname intials or sID is dbNull dim myDataTable as DataTable dim tmpStr as String.