ASP.NET Crystal Report Server Name Problem

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C#

ASP.NET

I have build a project in asp.net. I have use MS SQL 2005\ EXPRESS edition.
Now I have install MS SQL Server 2005. if I change the server name from web.config file then its works nicely. But problem is crystal reports is not works properly. Report is not coming.

Can any one help me??
NB:

Config file----------------------

add key="servername" value=(local)\SQLEXPRESS
add key="databasename" value=TestDB
add key="username" value=sa
add key="password" value=123

---------------------
c#

ReportDocument cryRpt = new ReportDocument();           
		cryRpt.Load(ReportName);               
string servername = ConfigurationManager.AppSettings["servername"].ToString();
string databasename = ConfigurationManager.AppSettings["databasename"].ToString();
string username = ConfigurationManager.AppSettings["username"].ToString();
string password = ConfigurationManager.AppSettings["password"].ToString();
CryRpt.SetDatabaseLogon(username, password, servername, databasename);

<pre lang="msil">Logon failed.
Details: ADO Error Code: 0x
Source: Microsoft OLE DB Provider for SQL Server
Description: [DBNETLIB][ConnectionOpen (Connect()).]SQL Server does not exist or access denied.
SQL State: 08001
Native Error: Error in File C:\DOCUME~1\RABIUL~1\LOCALS~1\Temp\Sale4MemberRpt {B732B111-F23C-4BE6-9523-6B1F667D31A9}.rpt:
Unable to connect: incorrect log on parameters.

Thanks in advance
Rasadul Alam