Unable to cast object

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SQL-Server-2005

C#3.0

C#

, +

I am developing a widows application using visual studio 2008 and SQL server 2005.

In the project I got an error while retreiving image from SQL 2005 database to Picturebox.
The error was "Unable to cast object of type 'System.Int32'to type System.Byte[]" while fetching image from database of int to byte array.

My code is as follows

byte[] img = (byte[])cmd.ExecuteScalar();
              string str = Convert.ToString(DateTime.Now.ToFileTime());
              FileStream fs = new FileStream(str, FileMode.CreateNew, FileAccess.Write);
              fs.Write(img, 0, img.Length);
              fs.Flush();
              fs.Close();
              PicOldPatient.Image = Image.FromFile(str);

Please help me if any one knows....