[gdal-dev] how to read the color value of particular pixel

[mail2vajram]

i want to know how to read the color value of particular pixel. and
previously i used the following code to read the color table.but now it 
throws null reference exception.why?. My objective is to prepare the Rater
legend control based on pixel values.


 Gdal.AllRegister();
            Dataset ds = Gdal.Open(@"D:\pr.IMG", Access.GA_ReadOnly);
            Band band = ds.GetRasterBand(1);
            ColorTable ct = band.GetRasterColorTable();
            ArrayList arraylist = new ArrayList();
            for (int i = 0; i < ct.GetCount(); i++)
            {
                ColorEntry ce = ct.GetColorEntry(i);
                Color cr1 = Color.FromArgb(ce.c4, ce.c1, ce.c2, ce.c3);
                arraylist.Add(cr1);
            }           
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