Is there any way of running mongo shell queries through the C# driver?

Yes, we can do by using 

BsonDocument.Parse()

As

var query = "{loc: { $near :{$geometry: { type: "Point", coordinates: [ -73.9667, 40.78 ] },$minDistance: 10,$maxDistance: 50}}}";
mongoCollection.Find(BsonDocument.Parse(query));

Yes, it is possible to run MongoDB shell queries through the C# driver.

You can use the MongoClient class to connect to the MongoDB server and then execute shell commands using the RunCommand method. The RunCommand method takes a CommandDocument parameter that represents the shell command to be executed.

Here's an example of how you can execute a MongoDB shell command using the C# driver:

using MongoDB.Bson;
using MongoDB.Driver;

// Connect to the MongoDB server
var client = new MongoClient("mongodb://localhost:27017");

// Select the database and collection to run the command on
var database = client.GetDatabase("mydatabase");
var collection = database.GetCollection<BsonDocument>("mycollection");

// Create the shell command to execute
var command = new BsonDocument
{
    { "find", "mycollection" },
    { "filter", new BsonDocument("name", "John") }
};

// Execute the shell command
var result = database.RunCommand<BsonDocument>(command);

// Print the result
Console.WriteLine(result.ToJson());

In this example, the RunCommand method is used to execute a find command on the mycollection collection with a filter that selects documents with a name field equal to "John". The result of the command is printed to the console as a JSON string.

Note that while it is possible to execute shell commands using the C# driver, it is generally recommended to use the driver's native APIs for interacting with the database, as these APIs are more efficient and provide better type safety.