如何在C＃Windows应用程序中5分钟后自动创建密钥

Question

I create one 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 i want to key regenerate automatically after 5 minute how to generate key

Answer 1

Add a timer to your form using the designer:

• Toolbox - Components - Timer
• Drag the time to your form
• It will appear on the bottom of the designer
• Right Click on it and select properties
• Timer interval: the number of milliseconds in 5 minutes
• Enabled: true if you want it to be enabled as soon as the from is created
• Properties - Events - Tick: the procedure that will be called about every 5 minutes.

Some improvements:

• Fill the time interval in the constructor: TimeSpan.FromSeconds(5).ToMilliSeconds;
• Enable the timer when the form is shown. This case you're guaranteed that your form is initialized the first time your timer ticks.