Have a few quick questions about a program I'm writing

[chipninja]

Ok I have the general idea of what i want in this program, but I just need some help in some areas.

For one thing I want to make sure in the email textbox that the user must enter text, a "@" and a "." then more text in that perticular order. As it is right now I used an if statement that checks that the characters are both there but does not make sure they are placed in that specific order


here is a sample of the code i used

private void txtEmail_TextChanged(object sender, EventArgs e)
        {
            //We will use "contains to make sure the user enters
            // "@" and "." in their email address

            Email = txtEmail.Text.Trim();
            Email = txtEmail.Text;
            string CheckEmailChar1 = "@";
            string CheckEmailChar2 = ".";

            if (Email.Contains(CheckEmailChar1) && Email.Contains(CheckEmailChar2)) 
            {
              
            }
            
            else
            {
                MessageBox.Show("Please include @ and . in the email feild");
            }

        }

I am aslo having a aproblem in the "Loan amount requested textbox and I'm not sure exactly why. The program runs but as soon as I input anything into that textbox, I end up with an error and the program stops running.

I am a bit tired so I hope my post was still somewhat coherent, I will get back to this post later and try and get this fixed fairly soon. You will find the full program in the zip file attached.