Error handler

Question

Hi !

I tried to make some kind of control on the user input so the Text Box can only allow for numeric values to be accepted , otherwise the program will throw an error exception , but I don't know why the exception handler did not work as I expect.



using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{

    int[] testScores = new int[3];


    void initGrades() {

       
        try
        {
           
            testScores[0] = int.Parse(txtScore1.Text);
           
        }

        catch (FormatException)
        {

            Console.WriteLine("The value {0}, Is not valid", txtScore1.Text);
          
        }

        catch (Exception exception) {

            Console.WriteLine("Unexpected Error : {0}",exception.Message);
           
        }

        finally {
       
        Console.WriteLine("Thanks");
       
       
        }


        try
        {
            testScores[1] = int.Parse(txtScore2.Text);

        }

        catch (FormatException)
        {

            Console.WriteLine("The value {0}, Is not valid", txtScore2.Text);

        }

        catch (Exception exception)
        {

            Console.WriteLine("Unexpected Error : {0}", exception.Message);

        }

        finally
        {

            Console.WriteLine("Thanks");


        }

        try
        {
            testScores[2] = int.Parse(txtScore3.Text);

        }

        catch (FormatException)
        {

            Console.WriteLine("The value {0}, Is not valid", txtScore3.Text);

        }

        catch (Exception exception)
        {

            Console.WriteLine("Unexpected Error : {0}", exception.Message);

        }

        finally
        {

            Console.WriteLine("Thanks");


        }

       
   
    }
   
   
    float calcGrades(){

        float grade;

        grade = (float)(testScores[0] + testScores[1] + testScores[2] / 3);

        return grade;


   
   
    }


    void displayGrade(float grade) {
   
    // checks conditions(expressions);if true executes code and exit

        if (grade > 90) {  //is greater than 90

            lblAverage.Text = "Your score is " + " " +  grade + "<br /> well done ! ";
  
        }

        if (grade > 80) {  //is greater than 80

            lblAverage.Text = "Your is score" + " " + grade + "<br /> Nice one ! ";

        }

        else  {  // if two expression not true just do this

            lblAverage.Text = "Your score is " + " "  + grade;

        }
   
    }

    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        // calls the initGrades method

        initGrades();

        // class the displayGrade and passes in parameter from return value of calcGrades


        displayGrade(calcGrades());

    }
}




Br

Henry