C#

/// <summary>
/// Repopulates the combo box based on the current military and increment settings.
/// </summary>
private void RepopulateChoices()
{
    Items.Clear();
    //while (Items.Count > 0)
    //    Items.RemoveAt(0);
    int i = 0;
    while (i < 1440)
    {
        DateTime dat = new DateTime(1, 1, 1, i / 60, i % 60, 0);
        if (ShowMilitary)
            Items.Add(dat.ToString("HH:mm"));
        else
            Items.Add(dat.ToString("h:mm tt"));
        i += Increment;
    }
}

/* Brief Decsription : This program checks whether the entered chatacter is a numeral or no.
I have used the IsDigit Method. The issue here is that, the input from keyboard is a string,
whereas the IsDigit method needs a character. Hence I have converted the string input to a character.

Now, when I enter any number from 0 to 9, it perfoms the functionality of addition and also if I 
enter any character it hroes an Exception. But if I enter any 2 digit number, then also it throws an
Exception, which is system generated. 

This is because of that converison to character. 

Kindly provide a solution wherein I can enter numerals greater than 9 without error */

using System;

namespsace TestException3
{
Class program
{
static void Main(string args[])
{
try
{
string s1,s2,ans;
char type,type1;

Console.WriteLine("please enter the variables : ");
s1=Console.ReadLine();
s2=Console.ReadLine();

type=Convert.ToChar(s1);
type1=Convert.ToChar(s2);

if(!(char.IsDigit(type)) || !(char.IsDigit(type1)))
{
throw new Exception("Please Enter numbers only");
}
else
{
ans=Convert.ToString(Convert.ToInt32(s1)+Convert.ToInt32(s2));
Console.WriteLine(Answer : {0}",ans);
Console.ReadLine();
}
catch(Exception e)
{
Console.WriteLine("Message : {0}", e.Message);
Console.ReadLine();
}
}
}
}