ASP.NET

static DataTable GetDuplicateRows(DataTable source, DataColumn id)
{
   var rows = source.Rows.Cast<DataRow>()
      .GroupBy(row => row[id])
      .Where(rowGroup => rowGroup.Count() > 1)
      .SelectMany(rowGroup => rowGroup)
      .Select(row => row.ItemArray)
      .ToList();
   
   var result = source.Clone();
   result.BeginLoadData();
   rows.ForEach(values => result.Rows.Add(values));
   result.EndLoadData();
   return result;
}

DataTable source = ...;
DataTable duplicateRows = GetDuplicateRows(source, source.Columns["ID"]);

civic060 wrote:

I have a webpage with two buttons Save & Close, Save & Add Next Question.

<input type='button' />
<input type='submit' />

civic060 wrote:

How can I call different functions for each of the buttons above.