how to auto increment image name as 1,2 and so on

Question

Hi all,

 

  Iam creating one application where data is save in jpg format with customer name+today datye but problem is when same customer detail im enter previous image is remove i want save data in ajay17-09-2016(1),ajay17-09-2016(2),(3) format 

 

Bitmap bitmap = new Bitmap(Screen.PrimaryScreen.Bounds.Width,

Screen.PrimaryScreen.Bounds.Height);

Graphics graphics = Graphics.FromImage(bitmap as Image);

graphics.CopyFromScreen(0, 0, 0, 0, bitmap.Size);

var date = DateTime.Now.ToString("dd-MM-yyyy");

string format = txtname.Text +=date;

bitmap.Save(@"E:\\Project backups\\Medical\\Sales_receipt\\" +format + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);

format ="";

this.Close();

Form3 f = new Form3();

f.Show();