System.Data.Common.DataTableMapping.GetDataColumn C# (CSharp) Method

        public DataColumn GetDataColumn(string sourceColumn, Type dataType, DataTable dataTable, MissingMappingAction mappingAction, MissingSchemaAction schemaAction)
        {
            return DataColumnMappingCollection.GetDataColumn(_columnMappings, sourceColumn, dataType, dataTable, mappingAction, schemaAction);
        }

 private void ParameterOutput(IDataParameter parameter, DataRow row, DataTableMapping mappings, MissingMappingAction missingMapping, MissingSchemaAction missingSchema)
 {
     if (0 != (ParameterDirection.Output & parameter.Direction))
     {
         object value = parameter.Value;
         if (null != value)
         {
             // null means default, meaning we leave the current DataRow value alone
             string columnName = parameter.SourceColumn;
             if (!string.IsNullOrEmpty(columnName))
             {
                 DataColumn dataColumn = mappings.GetDataColumn(columnName, null, row.Table, missingMapping, missingSchema);
                 if (null != dataColumn)
                 {
                     if (dataColumn.ReadOnly)
                     {
                         try
                         {
                             dataColumn.ReadOnly = false;
                             row[dataColumn] = value;
                         }
                         finally
                         {
                             dataColumn.ReadOnly = true;
                         }
                     }
                     else
                     {
                         row[dataColumn] = value;
                     }
                 }
             }
         }
     }
 }