>> the connections strings which i used in vs.net2003 isnot working here
Maybe a little mistake. Just post your connection string. Btw visit this site...

First you must to know the pattern of prime number then u can write the code.
see wikipedia (http://en.wikipedia.org/wiki/Prime_number) and FactMonster (http://www.factmonster.com/ipka/A0876084.html)

label1.Text = dateTimePicker1.Value.ToShortDateString();

Should be :
outputTextBox.Text ="\t\t ..........\r\n";

Search on Google :)
Visit this link (http://www.codeguru.com/csharp/.net/net_general/patterns/article.php/c12805/)

handle it with keydown event :
private void TextBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
{
if (e.KeyCode == Keys.Delete)
{
MessageBox.Show("you pressed delete key");...

yeah..you're welcome :)

I added one line code...see the red one :
private void cmdtam_Klik(object sender, EventArgs e)
{
string cstr;
cstr = "data source=knight;initial catalog=latihan;uid=sa;pwd=sri";...

this.Dispose(false);