//this is the method

private bool isInt(string strInput)
                {
                    int dataParse = 0;
                    if(int.TryParse(strInput, out dataParse) == true)
                 {
                    return true;
                 }
                 else
                 {
                    return false;
                 }
                }



//This is the code
 


            if (txtFirstNumber.TextLength > 0 && txtSecondNumber.TextLength > 0)
            {
                int exp = 0;
                //Check that the second number is an integer
                  if (isInt(txtSecondNumber.Text) == true)
                    {
                        exp = Convert.ToInt32(txtSecondNumber.Text);
                    }
                    else //If it is not an integer, give an error
                    {
                        MessageBox.Show("Second number must be an integert value.", "Fault Error");
                        txtSecondNumber.Focus();
                    }
            
                //If There is data, do the math            

                string output = "";
                double result;
                decimal firstnum = Convert.ToDecimal(txtFirstNumber.Text);
                for (int i = 0; i < exp; i++)
                {
                    result = Math.Pow((double)firstnum, (double)i);
                    
                    output += firstnum.ToString() + " ^ " + i.ToString() + " = " + result.ToString() + Environment.NewLine;
                }
                
                


                txtResult.Text = output;
            }
            else
            {
                MessageBox.Show("Please input data");
            }

            //Disable the add and subtract buttons
                     btnAdd.Enabled = false;
                    btnSubtract.Enabled = false;