I have just been adding these two lines (comment and command) to any linqpad script querying production databases as the first command to execute prior to running the query. Usually at the start of Main().

// Required to prevent concurrent locking of transactions
this.ExecuteCommand("SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;");

Further My Extensions:

http://stackoverflow.com/a/26668233/256431

Based upon a single extension in another answer, but essentially identical to Hallur Holm Johannessen's comment.

"When I change the TransactionScope, should the generated SQL have "WITH (NOLOCK)"??"

No, transaction isolation levels work differently, they do not cause the code generators to query hints, they are just set on the current connection.

When I change the TransactionScope, should the generated SQL have "WITH (NOLOCK)"??

At this point, I don't see the SQL results displaying the hint.

This option could also be take in to consideration if the current connection is marked as "Production" and apply the transaction scope automatically.

Also expose the ability to set Application Intent in connections to SQL,

Hallur - nice idea :) tnx

I have been using the following extension method.
You need to add it to the My Extensions file, which you can see in the My Queries tab.

public static class MyExtensions
{
public static IQueryable<T> DumpNoLock<T>(this IQueryable<T> query)
{
using (new System.Transactions.TransactionScope(TransactionScopeOption.RequiresNew,
new TransactionOptions
{
IsolationLevel = System.Transactions.IsolationLevel.ReadUncommitted
}))
{
return query.Dump();
}
}
}

So now you can dump your query using the following syntax:

Table1.Where(t1 => t1.Enabled).DumpNoLock()

Which is equivalent to including the NOLOCK option on your sql query.

Simple to implement but huge time saver for us users.

especially if you want it to replace SSMS

It would also be nice to have support for "set deadlock_priority low;" since any ad hoc queries we do don't want to get in production's way. I'm currently working on a workaround for this, but it would be nice to have it build into the context in some way.

Hi Bill,
If you want I've created a small snippet for TransactionScope - 'tscope':
(can used also as surround-with)

<?xml version="1.0" encoding="utf-8" ?>
<CodeSnippets xmlns="http://schemas.microsoft.com/VisualStudio/2005/CodeSnippet">
<CodeSnippet Format="1.0.0">
<Header>
<Title>TransactionScope</Title>
<Shortcut>tscope</Shortcut>
<Description></Description>
<Author>Shlomi</Author>
<SnippetTypes>
<SnippetType>Expansion</SnippetType>
<SnippetType>SurroundsWith</SnippetType>
</SnippetTypes>
</Header>
<Snippet>
<Code Language="csharp"><![CDATA[using (TransactionScope scope = new TransactionScope(TransactionScopeOption.Required,
new TransactionOptions { IsolationLevel = System.Transactions.IsolationLevel.ReadUncommitted }))
{
$selected$ $end$
}]]>
</Code>
</Snippet>
</CodeSnippet>
</CodeSnippets>

A big +3 here. We are required to use nolock hints when running ad hoc queries against production. This makes it difficult to use LINQPad as often as I'd like.