public static Boolean ValidateUser(string struser, string strpass)
{
    // Establish connection information
    SqlConnection conn_string = new   SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["Data Source=137.145.169.3;Initial Catalog=SICI4266;Persist Security Info=True;User ID=SICI4266G3;Password=*******"].ConnectionString);
    // Establish SQL command
    SqlCommand sql_comm = new SqlCommand("SELECT count(userID) FROM HIEPA.HIEPA_USERS where UserName = @usuario and UserPassword = @contrasena ; ", conn_string);
    // Provide Parameter values
    sql_comm.Parameters.AddWithValue("@usuario", struser);
    sql_comm.Parameters.AddWithValue("@contrasena", strpass);
    // Open the connection
    conn_string.Open();
    // Execute the SQL command and assign the resulting value to an integer variable
    Int32 intUserCount = Convert.ToInt32(sql_comm.ExecuteScalar());
    // Close the connection
    conn_string.Close();
    // Evaluate the integer variable content; greater than cero is a valid combination
    if (intUserCount == 1)
    {
        return true;
    }
    else
    {
        return false;
    }
}