Question

Please tell me if i can use “Not Like” Operator in Select method of DataTable as filter expression?
I mean something like this:

MyDataTable.Select("MyField Not Like '" + MyValue + "%'");

Answer 1

Yes, this works. For a list of all possible expressions see http://msdn.microsoft.com/en-us/library/system.data.datacolumn.expression.aspx

Here also is a sample program demonstrating this works.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            DataTable table = new DataTable();

            // Create the first column.
            DataColumn textColumn = new DataColumn();
            textColumn.DataType = System.Type.GetType("System.String");
            textColumn.ColumnName = "text";

            // Create the second column.
            DataColumn priceColumn = new DataColumn();
            priceColumn.DataType = System.Type.GetType("System.Decimal");
            priceColumn.ColumnName = "price";
            priceColumn.DefaultValue = 50;

            // Add columns to DataTable.
            table.Columns.Add(textColumn);
            table.Columns.Add(priceColumn);

            DataRow row = table.NewRow();
            row["text"] = "bc";
            table.Rows.Add(row);

            DataRow[] rows = table.Select("text not like 'a%'");
            Console.WriteLine(rows.Count());
        }
    }
}