c# window application program

Question

how i  produce Fibonacci series in c# window based application

Vulpes · Answer

Add a textbox (txtFib) and a button (btnNext) to your form.
Now, by double clicking on the button and the form itself in the VS designer, add the following handlers and code to your form:
public partial class Form1 : Form     {         public Form1()         {             InitializeComponent();         }
private long num1 = 0;         private long num2 = 1;
private void btnNext_Click(object sender, EventArgs e)         {             txtFib.Text = num2.ToString();             long temp = num1;             num1 = num2;             num2 = temp + num2;             if (num2             {                 num1 = 0;                 num2 = 1;                 txtFib.Text = "0";             }         }                  private void Form1_Load(object sender, EventArgs e)         {             txtFib.Text = "0";         }     }
Each time the button is pressed, the textbox will show the next number in the Fibonacci sequence. Notice that when the number reaches 20 digits, it will overflow the capacity of the long data type and the sequence will then begin again at 0.