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I am getting error "Cannot deserialize string from BsonType ObjectId" while trying to get all the record from MongoDb in C# WebAPI

My Id is

[BsonId]
public string Id { get; set; }
After Changing it to
[BsonRepresentation(BsonType.ObjectId)] 
public string Id { get; set; }
its working fine
But while i'm calling post method, its giving me different error
"'d05e139c-3a48-4213-bd89-eba0c22c3c6f' is not a valid 24 digit hex string."
How can solve this problem
My Model is:
public class EstablishmentDetails
    [BsonRepresentation(BsonType.ObjectId)] 
    public string Id { get; set; }
    public string EstablishmentName { get; set; }
    public string EstablishmentType { get; set; }
    public string Address { get; set; }
    public string City { get; set; }
    public int StateID { get; set; }
    public Int32 PIN { get; set; }
    public Int64 PhoneNumber { get; set; }
    public string EmailID { get; set; }
    public bool Published { get; set; }
    public string CreatedDate { get; set; }
    public string ModifiedDate { get; set; }
My repository fro Get method
public IEnumerable<EstablishmentDetails> GetAllEstablishmentDetails()
        if (Convert.ToInt32(mCollection.Count()) > 0)
            var EstablishmentDetailsCollection = mCollection.FindAllAs(typeof(EstablishmentDetails));
            if (EstablishmentDetailsCollection.Count() > 0)
                foreach (EstablishmentDetails item in EstablishmentDetailsCollection)
                    establishmentDetails.Add(item);
        var results = establishmentDetails.AsQueryable();
        return results;
My repository for Post method
public EstablishmentDetails Add(EstablishmentDetails ed)
        if (string.IsNullOrEmpty(ed.Id))
            ed.Id = Guid.NewGuid().ToString();
        mCollection.Save(ed);
        return ed;
                I think your question includes an answer to the question of many people ;) (BsonRepresentation)
– Mohsen Kamrani
                May 7, 2018 at 1:09
Guid.NewGuid() will not produce ObjectId.
Object Id is 12 byte data structure and Guid produce 16byte hex string (without '-')
You should remove attribute [BsonRepresentation(BsonType.ObjectId)] 
You can use any string as Id in your entity for example 'HiDude' and any string in utf8 format.
        
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