This exception occurs when you try to set an invalid SQL expression for the DataColumn.Expression property. The exception description may indicate more information about the problem. public class InvalidExpressionException : DataException { // Public Constructors public InvalidExpressionException ( ); public InvalidExpressionException ( string s ); // Protected Constructors protected InvalidExpressionException (System.Runtime.Serialization.SerializationInfo info , System.Runtime.Serialization.StreamingContext context ); } Hierarchy System.Object SubclassesEvaluateException , SyntaxErrorException |