Type Casting Issue

[firoz.raj]

Can anyone tell me ???Why i am getting Error.when i tried to run the following code.let me know please.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace CastingDemo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
           Int16 a= 10;
           Int32  b= 20;
           Int16 c;
           c = short(a + b);
           MessageBox.Show(c);
            
        }
    }
}