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var session = serviceFactory.GetSessionFromConnectionString("MyDynamicsInstance");
// Field values are set with Dictionary<string, object>.
var fieldValues = new Dictionary<string, object>() {
  { "firstname", "John" },
  { "lastname", "Smith" },
  { "emailaddress1", "example@example.com" }
};
var lead = await GenericEntity.InsertAsync(session, "lead", fieldValues);

var session = serviceFactory.GetSessionFromConnectionString("MyDynamicsInstance");
// Find a lead by email address.
var lead = await GenericEntity.LoadSingleAsync(session, "lead",
  (query, xexp) =>
  {
    query.Filter("emailaddress1 eq 'example@example.com'").selectSelect("firstname, lastname");
  }
);
// Returned objects support Dictionary syntax to access fields.
Console.WriteLine($"First name: {lead["firstname"]}, Last name: {lead["lastname"]}");

// Change a field value on a previously loaded lead.
lead["lastname"] = "Jones";
await lead.UpdateAsync(session);