Change Brightness of Image Realtime

public static Bitmap AdjustBrightness(Bitmap Image, int Value)         {            System.Drawing.Bitmap TempBitmap = Image;             float FinalValue = (float)Value / 255.0f;            System.Drawing.Bitmap NewBitmap = new System.Drawing.Bitmap(TempBitmap.Width, TempBitmap.Height);            System.Drawing.Graphics NewGraphics = System.Drawing.Graphics.FromImage(NewBitmap);              float[][] FloatColorMatrix ={                      new float[] {1, 0, 0, 0, 0},                      new float[] {0, 1, 0, 0, 0},                      new float[] {0, 0, 1, 0, 0},                      new float[] {0, 0, 0, 1, 0},                      new float[] {FinalValue, FinalValue, FinalValue, 1, 1}                 };            System.Drawing.Imaging.ColorMatrix NewColorMatrix = newSystem.Drawing.Imaging.ColorMatrix(FloatColorMatrix);            System.Drawing.Imaging.ImageAttributes Attributes = newSystem.Drawing.Imaging.ImageAttributes();            Attributes.SetColorMatrix(NewColorMatrix);              NewGraphics.DrawImage(TempBitmap, new System.Drawing.Rectangle(0, 0, TempBitmap.Width, TempBitmap.Height), 0, 0, TempBitmap.Width, TempBitmap.Height, System.Drawing.GraphicsUnit.Pixel, Attributes);            Attributes.Dispose();             NewGraphics.Dispose();             return NewBitmap;         }