C#

public class PaintedColumnStyle:DataGridTextBoxColumn
{
	protected override void Paint(System.Drawing.Graphics g, System.Drawing.Rectangle bounds, CurrencyManager source, int rowNum, System.Drawing.Brush backBrush, System.Drawing.Brush foreBrush, bool alignToRight)
	{
		foreBrush = new SolidBrush(GetColor(GetColumnValueAtRow(source,rowNum)));
		
		if(GetColumnValueAtRow(source,rowNum) != DBNull.Value)
		{
			object txt;
			decimal Num;
			txt = GetColumnValueAtRow(source,rowNum);
			if(txt.GetType() == typeof(decimal) )
			{
				Num = (decimal)txt;
			}
			else
			{
				Num = decimal.Parse((string)txt);
			}
			if(Num < 0)
			{
				backBrush = new SolidBrush(GetBackColor(GetColumnValueAtRow(source,rowNum)));
			}
			else
			{
				backBrush = new LinearGradientBrush(bounds, 
						Color.FromArgb(255, 255, 255),
						Color.FromArgb(13, 150, 255),
						92,false);
			}
		}
		//backBrush = new LinearGradientBrush(bounds, GetBackColor(GetColumnValueAtRow(source,rowNum)));
		base.Paint (g, bounds, source, rowNum, backBrush, foreBrush, alignToRight);
	}

class SingletonChildForm<T> : ChildFormBase
{
    private static SingletonChildFormHelper theForm =
        new SingletonChildFormHelper(typeof(T));

    public static ChildFormBase CreateOrActivate(Form parent)
    {
        return theForm.CreateOrActivate(parent);
    }
}

partial class UserCatalogForm : SingletonChildForm<UserCatalogForm>
{
    public UserCatalogForm()
    {
        InitializeComponent();
    }
}

//...
int scan0 = data.Scan0.ToInt32();

byte * colPixel;
byte * rowPixel;

byte innerColorB = innerColor.B;
byte innerColorG = innerColor.G;
byte innerColorR = innerColor.R;
byte innerColorA = innerColor.A;

int stride = data.Stride;

for (int y = 0; y < height; y ++)
{
	rowPixel = (byte *)(scan0 + y * stride);
	for (int x = 0; x < width; x++)
	{
		colPixel = rowPixel + 4 * x;
		*colPixel = innerColorB;
		*(colPixel + 1) = innerColorG;
		*(colPixel + 2) = innerColorR;
		*(colPixel + 3) = innerColorA;
	}
}
//...