Send Message to specific user SignalR - signalr

Question

Creating a chat application and want send message to a specific user.
I can send messages to a specific user but the message is appearing for others contact also.
Example: Dev is sending message to Josh
Dev Send "Hello" to Josh
Josh is having contacts as
Amit
Rita
Dev
and josh right now talking Amit at that time Dev message appear is Amit chat Screen
This is my ChatHub.cs---------
public void Send(string receiver, string message)
{
if (receiver != string.Empty && message != string.Empty)
{
string Sender = Context.User.Identity.Name;
Clients.Group(receiver).broadcastMessage(Sender, message);
Clients.Group(Sender).broadcastMessage(Sender, message);
ChatRepository CR = new ChatRepository();
CR.SaveConversation(Sender, receiver, message);
}
}
public override Task OnConnected()
{
string name = Context.User.Identity.Name;
Groups.Add(Context.ConnectionId, name);
return base.OnConnected();
}
please help I can't find the solution
Thank you
Edit: my approach to send message to specific user please check as discussed in Comments
public void Send(string receiver, string message)
{
if (receiver != string.Empty && message != string.Empty)
{
string Sender = Context.User.Identity.Name;
if ("Success" == CR.CheckingForConnetionBetweenUser(receiver, Sender)) //Checking connectivity from a XYZTable
{ //"Success" value from DB shows users are connected to each other
Clients.Group(receiver).broadcastMessage(Sender, message);
}
Clients.Group(Sender).broadcastMessage(Sender, message);
CR.SaveConversation(Sender, receiver, message);
}
}

Answer 1

Please, try to debug OnConnected first, check if Name has correct value. Is it possible that your clients establish connection before they get some claims?
Also, please, take a look into this article. https://learn.microsoft.com/en-us/aspnet/core/signalr/authn-and-authz?view=aspnetcore-5.0#use-claims-to-customize-identity-handling
If you will provide IUserIdProvider service to return Name claim or if you will map userId to ClaimTypes.NameIdentifier claim in your login code, you will be able to filter your SignalR clients using this method: https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.signalr.ihubclients-1.user?view=aspnetcore-5.0#Microsoft_AspNetCore_SignalR_IHubClients_1_User_System_String_
Default implementation for reference: https://github.com/aspnet/SignalR/blob/master/src/Microsoft.AspNetCore.SignalR.Core/DefaultUserIdProvider.cs
And you will be able to call client like this:
await Clients.User(receiver).broadcastMessage(Sender, message);
SignalR already know which principal is attached to which connection, so probably no need to create group for each user.