How to Validate Activation Key and proceed to Login Form

Question

Hi Friends,

 

i want to know how to validate the activation key and proceed to Next form i.e. Login Form.

 

I am developing the forms.

 

Can Anyone helps;

 

Here is the code:

 

private void button1_Click(object sender, EventArgs e)

{

try

{

if (Convert.ToInt32(textBox1.Text) + Convert.ToInt32(textBox2.Text) + Convert.ToInt32(textBox3.Text) + Convert.ToInt32(textBox4.Text) + Convert.ToInt32(textBox5.Text) == 1000)

MessageBox.Show(" Key Sucessfully Activated!");

login obj = new login();

obj.Show();

this.Hide();

else

MessageBox.Show("Enter Correct Key Number ");

}

catch (System.FormatException ex)

{

MessageBox.Show("Error! Activation Key contain Numbers");

}

}

 

HERE IS THE ERRORS : 

 

Error 1 Only assignment, call, increment, decrement, and new object expressions can be used as a statement D:\VS Projects\AMC\amc\amc\LicenceKey.cs 35 32 amc

 

Error 2 Invalid expression term 'else' D:\VS Projects\AMC\amc\amc\LicenceKey.cs 39 17 amc

 

Error 3 ; expected D:\VS Projects\AMC\amc\amc\LicenceKey.cs 39 21 amc