c# 4.0 - how to create secret key automatically after 5 minute in C# windows application -

i create 1 function in class file:

public string createprivacykey(string s3) {      prky = convert.tostring(s3);      return prky; } 

and function call in windows form on button click event:

private void button1_click(object sender, eventargs e) {     string cleartext = textbox2.text.trim();     string ciphertext=class1.encrypt(cleartext,true);     // txtdecryptedtext.visible = false;     //label3.visible = false;     textbox2.text = ciphertext;      label3.visible = true;     label5.visible = true;     label4.visible = true;      random val = new random();     int randomnumber1 = val.next(1001, 50000);     ra = convert.tostring(randomnumber1);      str = cs.createprivacykey(ra);     label5.text = str.tostring(); } 

but want key regenerate automatically after 5 minute how generate key

add timer form using designer:

• toolbox - components - timer
• drag time form
• it appear on bottom of designer
• right click on , select properties
• timer interval: number of milliseconds in 5 minutes
• enabled: true if want enabled created
• properties - events - tick: procedure called every 5 minutes.

some improvements:

• fill time interval in constructor: timespan.fromseconds(5).tomilliseconds;
• enable timer when form shown. case you're guaranteed form initialized first time timer ticks.