Breadcrumbs

[Code]

Create a new Windows From Application.
Add:
3 buttons
1 Picture Box
Details: Follow this tutorial and you won't be confused!
Double click on your form and put this code above everything.

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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;
using System.Drawing.Imaging;

This is just your simple dim's(I am use too VB.net so thats what i know them as)
Insert this under the public form1()

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        {
            InitializeComponent();
        }
        private static Bitmap bmpScreenshot;
        private static Graphics gfxScreenshot;

Double click your form and insert this code for your capture button.
This basically means that when your going to take a screenshot for the application to hide first then take the screenshot as a bmp then show the application. This way we do not have the physical application in the picture.
Button1: Capture

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{
            this.Hide();
            System.Threading.Thread.Sleep(1000);
            bmpScreenshot = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, PixelFormat.Format32bppArgb);
            gfxScreenshot = Graphics.FromImage(bmpScreenshot);
            gfxScreenshot.CopyFromScreen(Screen.PrimaryScreen.Bounds.X, Screen.PrimaryScreen.Bounds.Y, 0, 0, Screen.PrimaryScreen.Bounds.Size, CopyPixelOperation.SourceCopy);
            pictureBox1.Image = bmpScreenshot;
            System.Threading.Thread.Sleep(1000);
            this.Show();
        }

Now you may use a button, toolstrip button or anything for this.
This is basically your clear button. If you do not like the picture you just took this will clear your picture box.
Button2: Clear

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{
            pictureBox1.Image = null;
        }

This is how we will save your screenshot, this code tells the program too open a save window where you can chose where you want to save your image.
Button3: Save

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{
            saveFileDialog1.FileName = "";
            saveFileDialog1.ShowDialog();
            try
            {
                pictureBox1.Image.Save(saveFileDialog1.FileName);
                System.Diagnostics.Process.Start(saveFileDialog1.FileName);
                saveFileDialog1.FileName = "";
            }
            catch
            {
            }
        }

I hope this tutorial made sense and was helpful as this was my first C# tutorial!
If you see any errors or mistakes please point them out!

[MrAksel]

You cant convert a string "" to a image. It will be an error at the clear code

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{
      pictureBox1.Image = "";
}

[Axel]

I think an empty string represents null(vbNull) but I don't know

[Codex]

i don't know about c# but in vb.net you can do

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picturebox1.image = nothing

[Agust1337]

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picturebox1.Image = null;

works fine

[Zulf]

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picturebox1.Image = null;

works fine

Or

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pictureBox1.Clear();

[Code]

Sorry, i was not home. Just got back, i fixed up the code. Thanks for the help!