C#

static class DataSetMerging
{
    public static bool ExtendedMerge(System.Data.DataSet Current, System.Data.DataSet Incoming, bool DeleteAbscent)
    {
        bool result = false;
        if(Incoming != null)
        {
            foreach(System.Data.DataTable Table in Current.Tables)
            {
                System.Data.DataTable IncomingTable = Incoming.Tables[Table.TableName];
                if(IncomingTable != null && Table.Columns.Count == IncomingTable.Columns.Count && Table.PrimaryKey.Length != 0)
                {
                    int ctr = Table.Rows.Count-1;
                    while(ctr>-1)
                    {
                        System.Data.DataRow Row = Table.Rows[ctr];
                        object[] KeyValues = new object[Table.PrimaryKey.Length];
                        System.Data.DataColumn[] PrimaryKeys = new System.Data.DataColumn[Table.PrimaryKey.Length];
                        int ctr2 = 0;
                        while(ctr2<Table.PrimaryKey.Length)
                        {
                            KeyValues[ctr2] = Row[Table.PrimaryKey[ctr2]];
                            PrimaryKeys[ctr2] = IncomingTable.Columns[Table.PrimaryKey[ctr2].ColumnName];
                            ctr2++;
                        }
                        IncomingTable.PrimaryKey = PrimaryKeys;
                        System.Data.DataRow IncomingRow = IncomingTable.Rows.Find(KeyValues);
                        if(DeleteAbscent && IncomingRow == null)
                        {
                            Table.Rows.Remove(Row);
                        }
                        else if(IncomingRow != null)
                        {
                            bool UpdateRow = false;
                            int ctr3= 0;
                            while(ctr3<Table.Columns.Count)
                            {
                                if(Row[Table.Columns[ctr3].ColumnName].ToString() != IncomingRow[Table.Columns[ctr3].ColumnName].ToString())
                                {
                                    UpdateRow = true;
                                    Row[Table.Columns[ctr3].ColumnName] = IncomingRow[Table.Columns[ctr3].ColumnName];
                                }
                                ctr3++;
                            }
                            if(UpdateRow)
                            {
                                Row.AcceptChanges();
                            }
                            IncomingTable.Rows.Remove(IncomingRow);
                        }
                        // all rows verified.. now add remaining rows.
                        ctr--; // wel eentje aftellen.
                    }
                    if(IncomingTable.Rows.Count > 0)
                        Table.Merge(IncomingTable);
                }
            }
        }
        else
        {
            result = true;
        }
        //Current.Merge(Incoming, false);
        return result;
    }
}

if (!dtbTabela.Columns[iContador3].ReadOnly)
{
   UpdateRow = true;
   Row[Table.Columns[ctr3].ColumnName] = IncomingRow[Table.Columns[ctr3].ColumnName];
}

originSH wrote:

Easy ... only need to change one Move "sw1.Start();" to below the for loop

string largeString = new string(' ', 500000);

// largeString += shortString;

string largeString = new string(' ', 499990);
for (int j = 0; j < 1; j++)

sw1.Start();
var largeString = new { Length = 500000 };
// Touch Nothing Below Here

Stopwatch sw1 = new Stopwatch();
                        sw1.Start();
                        string shortString = "1234567890";
                        StringBuilder largeString = new StringBuilder();
                        for (int j = 0; j < 50000; j++) {
                                largeString.Append(shortString);
                        }            // Touch Nothing Below Here            
                        if (largeString.Length == 500000) {
                                Console.WriteLine( "Pass 1" );
                        } else {
                                Console.WriteLine( "Fail 1" );
                        }
                        if (sw1.ElapsedMilliseconds < 10000) {
                                Console.WriteLine( "Pass 2" );
                        } else {
                                Console.WriteLine( "Fail 2 - " + sw1.ElapsedMilliseconds );
                        }
                        Console.ReadLine();