System.Data.Common.DbDataAdapter.DbDataAdapter.Update C# (CSharp) Method

		public int Update (DataRow [] dataRows)
		{
			if (dataRows == null)
				throw new ArgumentNullException("dataRows");
			
			if (dataRows.Length == 0)
				return 0;

			if (dataRows [0] == null)
				throw new ArgumentException("dataRows[0].");

			DataTable table = dataRows [0].Table;
			if (table == null)
				throw new ArgumentException("table is null reference.");
			
			// all rows must be in the same table
			for (int i = 0; i < dataRows.Length; i++) {
				if (dataRows [i] == null)
					throw new ArgumentException ("dataRows[" + i + "].");
				if (dataRows [i].Table != table)
					throw new ArgumentException(
								    " DataRow["
								    + i
								    + "] is from a different DataTable than DataRow[0].");
			}
			
			// get table mapping for this rows
			DataTableMapping tableMapping = TableMappings.GetByDataSetTable(table.TableName);
			if (tableMapping == null) {
				tableMapping = DataTableMappingCollection.GetTableMappingBySchemaAction(
													TableMappings,
													table.TableName,
													table.TableName,
													MissingMappingAction);
				if (tableMapping != null) {
					foreach (DataColumn col in table.Columns) {
						if (tableMapping.ColumnMappings.IndexOf (col.ColumnName) >= 0)
							continue;
						DataColumnMapping columnMapping = DataColumnMappingCollection.GetColumnMappingBySchemaAction (tableMapping.ColumnMappings, col.ColumnName, MissingMappingAction);
						if (columnMapping == null)
							columnMapping = new DataColumnMapping (col.ColumnName, col.ColumnName);
						tableMapping.ColumnMappings.Add (columnMapping);
					}
				} else {
					ArrayList cmc = new ArrayList ();
					foreach (DataColumn col in table.Columns)
						cmc.Add (new DataColumnMapping (col.ColumnName, col.ColumnName));
					tableMapping =
						new DataTableMapping (
								      table.TableName,
								      table.TableName,
								      cmc.ToArray (typeof (DataColumnMapping)) as DataColumnMapping []);
				}
			}

			DataRow[] copy = table.NewRowArray (dataRows.Length);
			Array.Copy (dataRows, 0, copy, 0, dataRows.Length);
			return Update (copy, tableMapping);
		}