You need to include this Overloading functions in Our Class Named "emp" as shown below

class emp
{
       int ts;
//I am creating three functions using same name
       public void tsal(int sal)
       {
             MessageBox.Show(sal.ToString(),"Salary");
       }
       public void tsal(int sal,int bonus)
      {
            ts = sal + bonus;
            MessageBox.Show(ts.ToString(),"Salar+Bonus is ");
      }
      public void tsal(int sal, int bonus, int ta)
      {
             ts = sal + bonus + ta;
             MessageBox.Show(ts.ToString(),"Salary+Bonus+ta is ");
       }

}
private void Form1_Load(object sender, EventArgs e)
{

}
//I am calling three functions using button click event
private void button1_Click(object sender, EventArgs e)
{
      emp e1 = new emp();
      int s, b, t;
      s = 5000;
      b = 300;
       t = 200;
       e1.tsal(s);
       e1.tsal(s,b);
       e1.tsal(s,b,t);

}

Coming to the Output Use f5

You see a window as shown below