using System;

using System.Data;

public class Program

{

    public static void Main()

    {

        // Create a new DataTable titled 'Names.'

        DataTable namesTable = new DataTable("Names");

​

        // Add three column objects to the table.

        DataColumn idColumn = new  DataColumn();

        idColumn.DataType = System.Type.GetType("System.Int32");

        idColumn.ColumnName = "id";

        idColumn.AutoIncrement = true;

        namesTable.Columns.Add(idColumn);

​

        DataColumn fNameColumn = new DataColumn();

        fNameColumn.DataType = System.Type.GetType("System.String");

        fNameColumn.ColumnName = "Fname";

        fNameColumn.DefaultValue = "Fname";

        namesTable.Columns.Add(fNameColumn);

​

        DataColumn lNameColumn = new DataColumn();

        lNameColumn.DataType = System.Type.GetType("System.String");

        lNameColumn.ColumnName = "LName";

        namesTable.Columns.Add(lNameColumn);

​

        // Create an array for DataColumn objects.

        DataColumn [] keys = new DataColumn [1];

        keys[0] = idColumn;

        namesTable.PrimaryKey = keys;

​

        DataRow row;

        row = namesTable.NewRow();

​

        // Then add the new row to the collection.

        row["fName"] = "John";

        row["lName"] = null;

        namesTable.Rows.Add(row);

​

        var a = row[0];

        var b = row[1];

        int c;

        String s;

        decimal d = 1234;

​

        if(row[2] is DBNull)

        {

​

            decimal.TryParse(row[2].ToString(), out d);

        }

        else

        {

            c = (int)row[2];

        }

​

        Console.WriteLine(d);

    }

}