[C#] Visual Studio Database woes...

Site is on one domain and I need to remotely connect to an SQL Database.
- In the Server Explorer, connecting to the SQL Database uses Windows Authentication.
- With Windows Authentication on, produces untrusted zone error.
- With it off, produces failed login error.

The fix?
- Connection string format:
"Data Source=<source>;Persist Security Info=False;Initial Catalog=<initial_catalog>;Trusted_Connection=Yes"

- In Web.Config, add
<configuration>
   <system.web>
       <identity impersonate="true"/>

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Sql Db Type is numeric, but how to express it in C#?
- Use Decimal

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How to express VarChar(MAX) in C#?
- SqlDbType.VarChar, -1

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