sql server error online for bigrock hosting

login failed for user ' '. error showing on bigrock hosting for asp.net application. on login link there is login page after entering right credential it gives me "login failed for user 'shreesa.mdf'". Bigrock tech support teams fails to resolve this issue please help to solve this problem.

According to me there is some problems in ma web.config file.

I am also displaying code here..

<?xml version="1.0"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://ift.tt/1eW0XAj
  -->
<configuration>
    <system.web>

<customErrors mode="Off"/>
        <compilation debug="true" targetFramework="4.0">
            <assemblies>
                <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
                <add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
                <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/></assemblies></compilation>

    </system.web>

    <connectionStrings>


<add name="Conn" connectionString="Data Source=localhost;Initial Catalog=shreesa.mdf;Integrated Security=False; User Id=saachlrw; Password=******;" providerName="System.Data.SqlClient" />

    </connectionStrings>
</configuration>