getting error The ConnectionString property has not been initialsed

[agarwalsunitadhn]

Hi
I want to declare a coonectionstring in winapps as declared in web.config file in webapps.
I declare that in app.config as follows

<connectionStrings>
        <add name="ABC_Enterprises_.Properties.Settings.ABCEnterpriseDataConnectionString"
            connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\ABCEnterpriseData.mdf;Integrated Security=True;User Instance=True"
            providerName="System.Data.SqlClient" />
    </connectionStrings>
 

but now i dnt know how to call this in program.

Can you please help me
Thanks

[agarwalsunitadhn]

hello
I am using sql for the first time with dotnet.
I had created the database and directly using .net by choosing sqldatabase from new item
and in the form i write the following code. My code is :

 string constr = ConfigurationSettings.AppSettings["ConnectionString1"];
                SqlConnection conn = new SqlConnection(constr);
                conn.Open();
                SqlCommand cmd = new SqlCommand();
                string str = "insert into OwnerDetails(OwnerId,FirstName,MiddleName,LastName,Age,Occupation,Address,City,State,PinCode,TelNo,Others) values(1,@FirstName,@MiddleName,@LastName,@Age,@Occupation,@Address,@City,@State,@PinCode,@TelNo,@Others)";
                cmd.Connection = conn;
                cmd.Parameters.Add("@FirstName", SqlDbType.VarChar).Value = txtFirstName.Text;
                cmd.Parameters.Add("@MiddleName", SqlDbType.VarChar).Value = txtMName.Text;
                cmd.Parameters.Add("@LastName", SqlDbType.VarChar).Value = txtLastName.Text;
                cmd.Parameters.Add("@Age", SqlDbType.Int).Value = txtAge.Text;
                cmd.Parameters.Add("@Occupation", SqlDbType.VarChar).Value = txtOccupation.Text;
                cmd.Parameters.Add("@Address", SqlDbType.VarChar).Value = txtAddress.Text;
                cmd.Parameters.Add("@City", SqlDbType.VarChar).Value = cmbCity.SelectedItem.ToString();
                cmd.Parameters.Add("@State", SqlDbType.VarChar).Value = cmbState.SelectedItem.ToString();
                cmd.Parameters.Add("@PinCode", SqlDbType.VarChar).Value = txtPincode.Text;
                cmd.Parameters.Add("@TelNo", SqlDbType.VarChar).Value = txtTelNo.Text;
                cmd.Parameters.Add("@Others", SqlDbType.VarChar).Value = txtOthers.Text;
 
                cmd.CommandText = str;
                cmd.CommandType = CommandType.Text;
                cmd.ExecuteNonQuery();
                conn.Close();
 
App.config files setting:
<add name="ConnectionString1"
            connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\NGEnterpriseData.mdf;Integrated Security=True;User Instance=True"
            providerName="System.Data.SqlClient" />
 
 

But after when i ran the application i got the following error
The ConnectionString property has not been initialsed

Please suggest me why this error occurs and can i modify it