Json importer ready

DataImporterTool/Dialogs/DialogService.cs

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+using System.Windows.Forms;
+
+#nullable enable
+namespace DataImporterTool.Dialogs
+{
+    public class DialogService : IDialogService
+    {
+        public string? ChooseFolder()
+        {
+            using (var fbd = new FolderBrowserDialog())
+            {
+                var result = fbd.ShowDialog();
+                if (result == DialogResult.OK && !string.IsNullOrWhiteSpace(fbd.SelectedPath))
+                {
+                    return fbd.SelectedPath;
+                }
+            }
+
+            return null;
+        }
+
+        public void ShowWarning(string warningMessage)
+        {
+            MessageBox.Show(warningMessage, "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning);
+        }
+    }
+}

DataImporterTool/Dialogs/IDialogService.cs

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+#nullable enable
+namespace DataImporterTool.Dialogs
+{
+    public interface IDialogService
+    {
+        string? ChooseFolder();
+
+        void ShowWarning(string warningMessage);
+    }
+}