C Sharp error

Hi on the line starting '   sqlConn.ConnectionString = ConfigurationManager
I am getting the error "The name ConfigurationManager does not exist in the current contect

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Data.Sql;

namespace CRM_GHB
    public partial class Contacts : System.Web.UI.Page
        protected void Page_Load(object sender, EventArgs e)


        public void DisplayContacts()
            System.Data.SqlClient.SqlConnection sqlConn = new System.Data.SqlClient.SqlConnection();
            sqlConn.ConnectionString = ConfigurationManager.ConnectionStrings("GHBCRM_TSTConnectionString").ConnectionString;

            catch (Exception ex)
                Interaction.MsgBox(ex.Message, "connection failed");
Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAsked:
Who is Participating?
Gary DavisConnect With a Mentor Dir Internet SvcsCommented:
You need to Add Reference for System.Configuration.

Gary Davis
Vishal KedarConnect With a Mentor Commented:
You need to reference System.Configuration.dll in your project as well as the "using" statement.

Namespaces are (sometimes) "split" across assemblies. That means that types in a single namespace are actually in different assemblies.

To determine which assembly a BCL or FCL type is in, look it up on MSDN. If you look at the help for ConfigurationManager, you'll see that it specifies that it's in the System.Configuration assembly by looking near the top at "Assembly". This is the assembly you need to reference from your project
Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAuthor Commented:
Thanks very much
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