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DatabaseConnection/Services/DatabaseService.cs

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+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using MySql.Data.MySqlClient;
+
+namespace DatabaseConnection.Services
+{
+    public class DatabaseService
+    {
+        private string _connectionString = "Server=localhost;Database=biblioteka;User=root;Password=;";
+
+        public MySqlConnection Connection()
+        {
+            return new MySqlConnection(_connectionString);
+        }
+
+        public async Task<DataTable> ExecuteQuery(string query)
+        {
+            using MySqlConnection connection = Connection();
+            await connection.OpenAsync();
+            using MySqlCommand command = new(query, connection);
+
+            using var reader = await command.ExecuteReaderAsync();
+            var table = new DataTable();
+            table.Load(reader);
+            return table;
+        }
+
+        public async Task<int> ExecuteNonQuery(string query)
+        {
+            using MySqlConnection connection = Connection();
+            await connection.OpenAsync();
+            using MySqlCommand command = new(query, connection);
+
+            return await command.ExecuteNonQueryAsync();
+        }
+    }
+}