Sample: Associate a security role to a team

// Retrieve a role from CRM.
QueryExpression query = new QueryExpression
{
    EntityName = Role.EntityLogicalName,
    ColumnSet = new ColumnSet("roleid"),
    Criteria = new FilterExpression
    {
        Conditions =
    {
        // You would replace the condition below with an actual role
        // name, or skip this query if you had a role id.
        new ConditionExpression
        {
            AttributeName = "name",
            Operator = ConditionOperator.Equal,
            Values = {_roleName}
        }
    }
    }
};

Role role = _service.RetrieveMultiple(query).Entities.
    Cast<Role>().First();


// Add the role to the team.
_service.Associate(
       Team.EntityLogicalName,
       _teamId,
       new Relationship("teamroles_association"),
       new EntityReferenceCollection() { new EntityReference(Role.EntityLogicalName, _roleId) });

Console.WriteLine("Assigned role to team");