C#

protected override void OnKeyDown(KeyEventArgs e)
{
            base.OnKeyDown(e);

            if (e.KeyCode == Keys.Up && e.KeyCode == Keys.Space)
                MessageBox.Show("UP & SPACE");
}

cbBox.DataBinding.Clear();
cbBox.Text = "";

if(cbBox.Text =="")//here it shows previous text if user do not enter any data
// after clicking New button (in debugging), but if user enter some data then that 
//entered data
{
// related code
}

Bitmap image = new Bitmap("d:\\14.jpg");
            Bitmap bm = new Bitmap(image, 350, 300);

            System.Drawing.Bitmap TempBitmap = bm;
            float FinalValue = 0.5f;
            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 = new System.Drawing.Imaging.ColorMatrix(FloatColorMatrix);
            System.Drawing.Imaging.ImageAttributes Attributes = new System.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();

           picDecode.Image = NewBitmap;