In your cstring :
<add key="SqlConnectionString" value="Data Source=192.168.55.33\BDC\SQLEXPRESS;Initial Catalog=DMNG;UID=sa;Password=Support2010; Integrated Security=True;"/>
Replace : Data Source=192.168.55.33\SQLEXPRESS Or Source=BDC\SQLEXPRESS
try this....
Or Check Windows Auth /Sql Server Authentication If Windows Authentication then Username and Password from Cstring