Try catch not showing error message for formatException

Question

I am trying to catch FormatException from a text box. For example - if user enters number or any other character inside name text box field. Message will pop up - something went wrong. I'm fairly new to C# and I don't understand the concept of exceptions. Below does not work. What is correct exception for invalid format?

private void button1_Click(object sender, EventArgs e)
{
try
{
    string name = textBox1.Text;
    int age = int.Parse(textBox2.Text);

}
catch (FormatException )
{
    MessageBox.Show("Something went wrong");
}

Answer 1

Try this to show the message.

    try
        {
            double mydoubleParam = 0;
            // Assuming textBox1.Text is Name test box
            if (double.TryParse(textBox1.Text, out mydoubleParam))
            {
                 new Exception(" Numeric value in name field");
            }

            int age = int.Parse(textBox2.Text);// Assuming Number text box

            MessageBox.Show("How are you today?");
        }

        catch (FormatException ex)
        {
            MessageBox.Show("Something went wrong");
        }

Answer 2

you can handle it in the TextChanged event like this:

private void textBox1_TextChanged(object sender, EventArgs e)
        {
            int a;
            bool isNumeric = int.TryParse(textBox1.Text, out a);
            if (isNumeric)
            {
                MessageBox.Show("Something went wrong");
            }
        }

Answer 3

 catch (FormatException  ex)
    {
       MessageBox.Show("Something went wrong " + ex.ToString() );
    }

USE ex as variable in Catch.

UPDATE (As per comment )

 catch (FormatException  ex)
{
   MessageBox.Show("Something went wrong !");
}

Answer 4

If you need to check for numbers inside the name textbox, then:

try {
        string name = textBox1.Text;
        Regex regex = new Regex("[0-9]");
        if (regex.IsMatch(name)) {
            throws new FormatException();
        }
        int age = int.Parse(textBox2.Text);
        MessageBox.Show("How are you today?");
    }
    catch (FormatException) {
       MessageBox.Show("Something went wrong");
    }

You should also show a more specific message for each of the cases.

UPDATE

What you should really be doing is:

var regex = new Regex("[0-9]");
if (regex.IsMatch(textBox1.Text)) {
    MessageBox.Show("There was a number inside name textbox.","Error in name field!");
    return;
}
try {
    Convert.ToInt32(textBox2.Text);
} catch (Exception) {
    MessageBox.Show("The input in age field was not valid","Error in name field!");
    return;
}