error while connecting to database

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.NET3.5

.NET

Cannot open database "" requested by the login. The login failed. Login failed for user ''.

the following error is generated while connecting to database

connection string in web.config

<add name="Homeconstr" connectionString="Server=.\sqlexpress;database=CorporateDatabase1;Integrated Security=true">

connection in aspx file

SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["Homeconstr"].ConnectionString);
        con.Open();