Able to create and read data from the DB

Repositories/UserRepository.cs

@@ -14,6 +14,7 @@ public class UserRepository
     private string _connectionString;
     private string _databaseName;
     private string _tableName;
+    private readonly IMongoCollection<User> _bookCollection;
     #endregion
 
 
@@ -23,17 +24,35 @@ public class UserRepository
         this._connectionString = connectionString;
         this._databaseName = "TextSender";
         this._tableName = "Users";
+        var client = this.InitializeClient();
+        this._bookCollection = client.GetDatabase(this._databaseName).GetCollection<User>(this._tableName);
     }
     #endregion
 
     #region Metods
     public void CreateUser(User user)
     {
-        var client = this.InitializeClient();
-
-        var coll = client.GetDatabase(this._databaseName).GetCollection<User>(this._tableName);
-        coll.InsertOne(user);
+        this._bookCollection.InsertOne(user);
+        var i = 0;
     }
+
+    public List<User> RetrieveAllUsers()
+    {
+        return this._bookCollection.Find(_ => true).ToList();
+    }
+
+    public void Update(User user)
+    {
+        var filter = Builders<User>.Filter.Eq(u => u.Id, user.Id);
+        this._bookCollection.ReplaceOne(filter, user);
+    }
+
+    public void Delete(User user)
+    {
+        var filter = Builders<User>.Filter.Eq(u => u.Id, user.Id);
+        this._bookCollection.DeleteOne(filter);
+    }
+
     private MongoClient InitializeClient()
     {
         return new MongoClient(this._connectionString);