The ConnectionString property has not been initialized random error

Question

Hi,
Can someone please help me?
I randomly get an error when running my website:
The ConnectionString property has not been initialized.
First time I run the web page it works. Second time it fails. Is this got anything to do with static methods?
This is my code in DAL layer:
ConStrings.cs
public class ConStrings
/// </summary>
public static string PizzaDeliveryConnectionString
get
// get from PL web.config
string myconnectionString = ConfigurationManager.ConnectionStrings["PizzaDeliveryConnectionString"].ConnectionString;
return myconnectionString;
public static SqlConnection GetPizzaDeliveryConnection()
return new SqlConnection(PizzaDeliveryConnectionString);
DLCustomer.cs
public class DLCustomer
static SqlConnection connString = DL.ConStrings.GetPizzaDeliveryConnection();
public static DataSet GetCustomerByPhoneNumber(string phonenumber)//static is good for returing data from db
DataSet ds = null;
ds = new DataSet();
try
using (var connection = connString)//using doesn't require connection closed
connection.Open();
using (SqlCommand cmd = new SqlCommand("GetCustomerByPhoneNumber", connection))
cmd.Connection = connection;
cmd.CommandType = System.Data.CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@phonenumber", phonenumber);
using (SqlDataAdapter da = new SqlDataAdapter(cmd))
da.Fill(ds, "CustomersTable");
return ds;
catch (SqlException ex)
return ds;
BUSINESS LAYER
Customer.cs
public class Customer
private string phonenumber;
private DL.DLCustomer customerData;
public int CustomerId { get; set; }
public string CustomerName { get; set; }
public String PhoneNumber
get
return this.phonenumber;
set
this.phonenumber = value;
if (this.PhoneNumber == "")
throw new Exception("Please provide Tel ...");
public Customer () // Default Constructor
//An instance of the Data access layer!
customerData = new DL.DLCustomer();
/// Function Find customer. Calls the
/// function in Data layer.
/// It returns the details of the customer using
/// customer ID via a Dataset to GUI tier.
/// </SUMMARY>
public static DataSet GetCustomerByPhoneNumber(Customer customer)
if (customer.phonenumber == "")
throw new Exception("Please provide phonenumber to search");
DataSet data = null;
data = DL.DLCustomer.GetCustomerByPhoneNumber(customer.phonenumber);
return data;
Presentation layer
protected void btnOrder_Click(object sender, EventArgs e)
Customer customer = new Customer();
//string dt = Request.Form[txtDate.UniqueID];
customer.PhoneNumber = txtPhoneNumber.Text;
// ClassLibrary1.DbFunc1.GetCustomerByPhoneNumber(customer) ;
rptCustomers.DataSource = Customer.GetCustomerByPhoneNumber(customer);
rptCustomers.DataBind();
web.config
<configuration>
<connectionStrings>
<add name="PizzaDeliveryConnectionString" connectionString="Data Source=mycomp;Initial Catalog=PizzaDelivery;Integrated Security=True" providerName="System.Data.SqlClient" />
</connectionStrings>

Answer 1

Hi
collie12,
Since you develop in web page. Please try to use
System.Web.Configuration.WebConfigurationManager.ConnectionStrings["YouConnStringName"].ConnectionString;
This requires references to System.Configuration.dll and System.Web.dll.
WebConfigurationManager.ConnectionStrings Property gets the Web site's connection strings.
Please also try to remove your static keyWords, it will have an effect on "using" statement.
Best regards,
Kristin
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