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using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlTypes;
class Program
{
static void Main()
{
WorkWithSqlNulls();
Console.ReadLine();
}
// <Snippet1>
static private void WorkWithSqlNulls()
{
DataTable table = new DataTable();
// Specify the SqlType for each column.
DataColumn idColumn =
table.Columns.Add("ID", typeof(SqlInt32));
DataColumn descColumn =
table.Columns.Add("Description", typeof(SqlString));
// Add some data.
DataRow nRow = table.NewRow();
nRow["ID"] = 123;
nRow["Description"] = "Side Mirror";
table.Rows.Add(nRow);
// Add null values.
nRow = table.NewRow();
nRow["ID"] = SqlInt32.Null;
nRow["Description"] = SqlString.Null;
table.Rows.Add(nRow);
// Initialize variables to use when
// extracting the data.
SqlBoolean isColumnNull = false;
SqlInt32 idValue = SqlInt32.Zero;
SqlString descriptionValue = SqlString.Null;
// Iterate through the DataTable and display the values.
foreach (DataRow row in table.Rows)
{
// Assign values to variables. Note that you
// do not have to test for null values.
idValue = (SqlInt32)row["ID"];
descriptionValue = (SqlString)row["Description"];
// Test for null value in ID column.
isColumnNull = idValue.IsNull;
// Display variable values in console window.
Console.Write("isColumnNull={0}, ID={1}, Description={2}",
isColumnNull, idValue, descriptionValue);
Console.WriteLine();
}
// </Snippet1>
}
}