Cast mellem taltyper

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

namespace WindowsFormsApp10
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnKlik_Click(object sender, EventArgs e)
        {
            float tal1 = 5.5f;
            double tal2 = 5.75;
            int tal3 = 7;

            //tal2 = tal1 + tal3;

            tal3 = (int) tal1 + (int) tal2;
            MessageBox.Show(tal3.ToString());
        }
    }
}