dynamic connection string with EF4, get metadata path is not valid - asp.net-mvc-2

Question

Here is my problem.
I use a dynamic connection string for my Entity Framework context.
//In Web Config
add key="DataSource" value="WIN-QBRH0MJL8IT\ISS" />
//In my EntityFactory.cs
public static DBEntities GetEntity()
{
var scsb = new SqlConnectionStringBuilder();
scsb.DataSource = ConfigurationManager.AppSettings["DataSource"];
scsb.InitialCatalog = "db1";
scsb.MultipleActiveResultSets = true;
scsb.IntegratedSecurity = true;
if (HttpContext.Current.Session["DBName"] == null)
{
HttpContext.Current.Response.Redirect("/Account/Step1");
}
else
{
scsb.InitialCatalog = HttpContext.Current.Session["DBName"].ToString();
}
var builder = new EntityConnectionStringBuilder();
builder.Metadata = "metadata=~/bin/Models/DBModel.csdl|~/bin/Models/DBModel.ssdl|~/bin/Models/DBModel.msl";
builder.Provider = "System.Data.SqlClient";
builder.ProviderConnectionString = scsb.ConnectionString;
DBEntities db = new DBEntities(builder.ConnectionString);
return db;
}
I Know the problem is for this line :
builder.Metadata =
"metadata=~/bin/Models/DBModel.csdl|~/bin/Models/DBModel.ssdl|~/bin/Models/DBModel.msl";
I check and the csdl, ssdl, msl are in /mvcinfosite/bin/Models/.csdl,.ssdl,.msl
The configuration for my edmx is:
Metadata Artifact Processing : Copy to Output Directory
Here is the full error
The specified metadata path is not valid. A valid path must be either
an existing directory, an existing file with extension '.csdl',
'.ssdl', or '.msl', or a URI that identifies an embedded resources
Thanks

Answer 1

Try to remove ~ character and use valid relative path to your app root. I think it is not able to work with this special character used on in ASP.NET application.