DataSource Controls :: System.ArgumentException: Format Of The Initialization String Does Not Conform To Specification Starting At Index 0

In the codes below, I got an error on the 2nd line. The "Connection" string is defined in Web.Config.

What does the Exception Details mean? How to solve the error?

Dim strConn
As
String = ConfigurationManager.ConnectionStrings("Connection").ConnectionString
Dim conn
As
New SqlConnection("strConn")
Dim queryString
As
String =
"SELECT CustomerID, CompanyName FROM dbo.Customers"
Dim adapter
As SqlDataAdapter =
New SqlDataAdapter(queryString, conn)
Dim customers
As DataSet =
New DataSet
adapter.Fill(customers, "Customers")

Exception Details: System.ArgumentException: Format of the initialization string does not conform to specification starting at index 0.