C# How do I save different sequential images to different filenames

This code sorts out problem:

public int B =1;
        
private void button3_Click(object sender, EventArgs e)

{
Bitmap c = new Bitmap(pictureBox1.Image);
c.Save("C:\\image" + B.ToString() + ".gif", System.Drawing.Imaging.ImageFormat.Gif);
B ++;
} 

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

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{

// counter
private int counter=0;


public Form1()
{
InitializeComponent();
pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;


}

private Bitmap Get_screen()
{
Size s = Screen.PrimaryScreen.Bounds.Size;
Bitmap bt = new Bitmap(s.Width, s.Height);
Graphics g = Graphics.FromImage(bt);
g.CopyFromScreen(0, 0, 0, 0, s);
return bt;
}

private void timer1_Tick(object sender, EventArgs e)
{
pictureBox1.Image=Get_screen();

// increase counter here
counter++;
}

private void button1_Click(object sender, EventArgs e)
{
timer1.Enabled = true;
}

private void button2_Click(object sender, EventArgs e)
{
timer1.Enabled = false;
}

public void button3_Click(object sender, EventArgs e)
{
Bitmap c = new Bitmap(pictureBox1.Image);
//c.Save("C:\\image.gif", System.Drawing.Imaging.ImageFormat.Gif);
c.Save("C:\\image" + counter.ToString() + ".gif", System.Drawing.Imaging.ImageFormat.Gif);

}

}
}


If you are planing to convert the saved images to avi file, I think the image frames you saved in each click
is not sufficient in terms of numbers of the images for a smooth avi files. If you move the code inside the
"button3_Click" to an event which fires based on pre-setting times, like your timer1_Tick, you
can get good results.

You can find useful and convinient save image stuffs here:
http://www.artuxsoft.com