[C#/Drawing] Memory Issue - Memory Keeps Rising

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Dear CodeProject Members,

I have been facing serious memory issues and they are driving me nutes. Currently I am making a terraria like game, as you can see on this video:
https://www.youtube.com/watch?v=bQ_9m-KkdBQ[^]

I have been able to make a fully working chunk system, and so far have updated it so that I can have about 250 different kind of blocks. Although here is not where my problem lies I seem to be only gaining memory. It's driving me nuts and I have no idea why. This is what I mean:

http://i49.tinypic.com/2n7f32t.png

I tried drawing only with the graphics from the Paint Event itself but this resulted the same with even more memory. Is this normal or am I seriously messing something up?

Here is my piece of code:

protected override void OnPaint(PaintEventArgs e)
{
    // -- Clear.
    e.Graphics.Clear(this.BackColor);

    // -- Draw on bitmap..
    Bitmap _Bitmap = new Bitmap(this.ClientSize.Width, this.ClientSize.Height);
    using (Graphics g = Graphics.FromImage(_Bitmap))
    {

        DrawWorld(g);
        DrawPlayer(g);
        DrawInformation(g);
    }

    // -- Draw the Bitmap.
    e.Graphics.DrawImage(_Bitmap, 0, 0, this.ClientSize.Width, this.ClientSize.Height);

    // -- Dispose the bitmap.
    _Bitmap.Dispose();

    // -- Flush.
    e.Graphics.Flush();

    // -- Variables.
    GC.Collect();
    GC.WaitForPendingFinalizers();
}

The funny thing is, is, that without even going out of the first chunk the issue still occurs, so it is not a chunk error. Which I have also checked over 100+ times.

Let me also add that this memory does not drop down to it's original amount after a while, people told me that.

Anyone ? Help ! :L