Code:

            string FileName;
            string ConnectionString;
            System.Data.SqlClient.SqlConnection Connection;
            System.Data.SqlClient.SqlCommand Command;
            System.IO.Stream FileStream;

            // Set the file name and connection string
            FileName = "C:\\Temp\\Test.doc";
            ConnectionString = "data source=.;initial catalog=Test;persist security info=False;user id=sa;password=;packet size=4096;Connect Timeout=240";

            // Open file stream
            FileStream = System.IO.File.OpenRead(FileName);
            byte[]  FileContents=new byte[FileStream.Length - 1];
            // Read contents of file into Byte array
            FileStream.Read(FileContents, 0, (int)FileStream.Length);
            // Close file stream
            FileStream.Close();

            // Create connection to database
            Connection = new System.Data.SqlClient.SqlConnection (ConnectionString);

            // Create insert command
            Command = new System.Data.SqlClient.SqlCommand("INSERT INTO Test(FileContents) VALUES (@FILECONTENTS)", Connection);
            Command.Parameters.Add (new System.Data.SqlClient.SqlParameter("@FILECONTENTS", FileContents));

            // Open connection
            Connection.Open();

            // Perform update
            Command.ExecuteNonQuery();

            // Close connection
            Connection.Close()