Stored Proc Won't Update From C# .NET Code, But Will Update When Testing On Its Own.

I'm having a strange problem that I can't figure out. I have an SQL stored procedure that updates a small database table. When testing the Stored Procedure from the Server Explorer, it works fine. However, when I run the C# code that's supposed to use it, the data doesn't get saved. The C# code seems to run correctly and the parameters that are passed to the SP seem to be okay. No exceptions are thrown.

The C# code:

   SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["touristsConnectionString"].ConnectionString);
SqlCommand cmd = new SqlCommand("fort_SaveRedirectURL", conn);
cmd.CommandType = CommandType.StoredProcedure;
Label accomIdLabel = (Label)DetailsView1.FindControl("lblID");
int accomId = Convert.ToInt32(accomIdLabel.Text);
cmd.Parameters.Add("@accomId", SqlDbType.Int).Value = accomId;
cmd.Parameters.Add("@path", SqlDbType.VarChar, 250).Value = GeneratePath();
try
{
conn.Open();
cmd.ExecuteNonQuery();
}
catch(Exception ex)
{
throw ex;
}
finally
{
conn.Close();
}

 The Stored Procedure:

  ALTER PROCEDURE developers.fort_SaveRedirectURL
(
@accomId int,
@path varchar(250)
)
AS
DECLARE
@enabled bit,
@oldpath varchar(250)

/* Ensure that the accommodation has been enabled */
SELECT @enabled = enabled FROM Experimental_Accommodation
WHERE Experimental_Accommodation.id = @accomId

IF (@enabled = 1)
BEGIN
/* Now check if a path already exists */
SELECT @oldpath = oldpath FROM Experimental_Adpages_Redirect
WHERE Experimental_Adpages_Redirect.accom_id = @accomId

IF @oldpath IS NULL
BEGIN
/* If Path already exists then we should keep the existing URL */
/* Otherwise, we need to insert a new one */
INSERT INTO Experimental_Adpages_Redirect
(oldpath, accom_id)
VALUES (@path,@accomId)
END
END
RETURN