yes i solved the problem:
FileStream st = new FileStream(curFileName, FileMode.Open);
byte[] buffer = new byte[st.Length];
st.Read(buffer, 0, (int)st.Length);
st.Close();
Program.Connection2Server();
SqlCommand cmd1 = new SqlCommand("UPDATE Faculty_details SET photo=@image WHERE Faculty_code ='"+textBox1.Text+"'", Program.con);
SqlParameter param;
param=cmd1.Parameters.Add(new SqlParameter("@image", buffer));
int i=cmd1.ExecuteNonQuery();
Program.con.Close();
and its working....