How to implement this using Windows forms?

I have two problems with my windows form in Visual Basic .NET 2008. If you have worked with sticky notes you will understand me better.

Now my problems:

1. If you look you'll see the background color of number 1 and 2 are diffrent but both belongs to the same control. How is this possible?
2. In right bottom corner, there is something by which a user can resize the form. How I can开发者_开发知识库 do this?

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Item 1: I think you are referring to LinearGradient Brush-- look in the System.Drawing.Drawing2D class.

Item 2: They are drawing a resize handler. You can try using the ControlPaint.DrawSizeGrip method or draw your own.

Update:

Per your comments, you can look into Owner-drawing a Windows.Forms TextBox

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You can draw a gradient background by overriding OnPaintBackground():

    protected override void OnPaintBackground(PaintEventArgs e)
    {
        // set these to whatever you want 
        Color color1 = Color.LightBlue; 
        Color color2 = Color.DarkBlue;

        using (Brush backbrush =
            new LinearGradientBrush(e.ClipRectangle, color1, color2,
                LinearGradientMode.Vertical))
        {
            e.Graphics.FillRectangle(backbrush, e.ClipRectangle);
        }

    }

You can show the size gripper by setting the form's SizeGripStyle to Show:

SizeGripStyle = SizeGripStyle.Show;

Or just set it in the designer.

EDIT: Look at this page for creating a transparent textbox (if the textbox is transparent, the gradient form background will show through.)