How to do barcode 128 type A B C in C#

You can use ItextSharp to generate a barcode.

Right click on your project, then select Nuget Manage Packages, search itextsharp and install it.

Next, you can use the following code to create a barcode 128 type A,B,C

Barcode128 code128          = new Barcode128();
code128.CodeType            = Barcode.CODE128;
code128.ChecksumText        = true;
code128.GenerateChecksum    = true;
code128.Code                = "Barcode 128 type B";
System.Drawing.Bitmap bmp    = new System.Drawing.Bitmap(code128.CreateDrawingImage(System.Drawing.Color.Black, System.Drawing.Color.White));
pictureBox1.Image = bmp;

Enter a text, then click the button to generate a barcode