SqlConnection miConexion = new SqlConnection("data source = snare.arvixe.com; initial catalog=*****; user id=*****; password=*****");
        public int Login(string user, string password, int idEmpresa)
        {
            try
            {
                if (miConexion.State == ConnectionState.Closed)
                {
                    miConexion.Open();
                }
                SqlCommand comando = new SqlCommand("select e.Email, e.Llave_Razon, c.llaveRazon, c.id, c.Nombre,c.Nombre1,c.Apellido1 , c.Apellido2, c.Clave, c.idEmpresa,c.llaveEmp from CrmCustomersEmails as e inner join CrmCustomers as c on e.Customer_ID = c.id where e.Email = '" + user + "'and c.Clave = '" + password + "'and idEmpresa = '" + idEmpresa + "'", miConexion);
                comando.ExecuteNonQuery();
                DataSet ds = new DataSet();
                SqlDataAdapter da = new SqlDataAdapter(comando);
                da.Fill(ds, "CrmCustomers");
                da.Fill(ds, "CrmCustomersEmails");
                //utilizado para representar una fila de la tabla q necesitas en este caso usuario
                DataRow DR;
                DR = ds.Tables["CrmCustomers"].Rows[0];
                DR = ds.Tables["CrmCustomersEmails"].Rows[0];
                if ((user == DR["Email"].ToString()) && (password == DR["Clave"].ToString()) && (idEmpresa.ToString() == DR["idEmpresa"].ToString()))
                {
                    SqlDataReader reader = comando.ExecuteReader();
                    if (reader.Read())
                    {
                        //LlaveEmp, es en CrmCustomers id, en CrmCustomersEmails ID_Customers, y Para generar Recibos es cuales
                        LlaveEmpCualesRecibos = Guid.Parse((reader["id"].ToString()));
                        llaveEmpFormatoString = (reader["id"].ToString());
                        LlaveRazonEstado = (reader["llaveRazon"].ToString());
                        LlamveEmpEstado = (reader["llaveEmp"].ToString());
                    }
                    miConexion.Close();
                    return 1;
                }
                else
                {
                    miConexion.Close();
                    return 2;
                }
            }
#pragma warning disable CS0168 // The variable 'ex' is declared but never used
            catch (Exception ex)
#pragma warning restore CS0168 // The variable 'ex' is declared but never used
            {
                miConexion.Close();
                return 3;
            }
        }

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="PortalCliente.PortalCliente" android:versionCode="1" android:versionName="1.0" android:installLocation="auto">
    <uses-sdk android:minSdkVersion="16" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.BIND_TELECOM_CONNECTION_SERVICE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <application android:label="PP- Portal Proveedor"></application>
</manifest>