This exception occurs when you attempt to modify a value in a read-only field (a column that has DataColumn.ReadOnly set to true ). public class ReadOnlyException : DataException { // Public Constructors public ReadOnlyException ( ); public ReadOnlyException ( string s ); // Protected Constructors protected ReadOnlyException (System.Runtime.Serialization.SerializationInfo info , System.Runtime.Serialization.StreamingContext context ); } Hierarchy System.Object |