System.Data.Common.DataColumnMappingCollection.Contains C# (CSharp) Method

        public bool Contains(object value)
        {
            return (-1 != IndexOf(value));
        }

 public static DataColumnMapping GetColumnMappingBySchemaAction(DataColumnMappingCollection columnMappings, string sourceColumn, MissingMappingAction mappingAction)
 {
     if (columnMappings.Contains(sourceColumn))
     {
         return(columnMappings[sourceColumn]);
     }
     if (mappingAction == MissingMappingAction.Ignore)
     {
         return(null);
     }
     if (mappingAction == MissingMappingAction.Error)
     {
         throw new InvalidOperationException(String.Format("Missing SourceColumn mapping for '{0}'", sourceColumn));
     }
     return(new DataColumnMapping(sourceColumn, sourceColumn));
 }