Restore sqlite database in xamarin forms

I implemented backup file and it copy my database to sdcard. Below is apart of my code:

var destinationPath = string.Format("/sdcard/MyTaskDatabase_{0:dd-MM-yyyy_HH-mm-ss-tt}.db", System.DateTime.Now);

after that i implemented restore backup like below:

`async void RestorDbClickedAsync(object sender, EventArgs e)
{
string[] mimeType = { "application/x-sqlite3" };
try
{
FileData filedata = await CrossFilePicker.Current.PickFile(mimeType);

        var fileAccessHelper = DependencyService.Get<IFileAccessHelper>();
        var getFilePath = string.Format("/sdcard/{0:dd-MM-yyyy_HH-mm-ss-tt}", filedata.FileName);

        fileAccessHelper.CopyAndRestore(getFilePath);
    }
    catch (Exception ex)
    {
        await DisplayAlert("Error", ex.Message.ToString(), "ok");
    }
}`

and Function CopyAndRestore() in class FileAccessHelper is like below:

`public void CopyAndRestore(string sourcePath)
{
var dbFileName = "TodoSQLite.db3";
TodoItemDatabase yourSQliteRepository = new TodoItemDatabase(GetLocalFilePath(dbFileName));
string destinationPath = GetLocalFilePath(dbFileName);

    yourSQliteRepository.DeleteAllDatabase();
    yourSQliteRepository.CloseDb();

    System.IO.File.Copy(sourcePath, destinationPath, true);
}`

My code doesn't have any error but it doesn't work and restore the database
Do you have any idea?
Can you help me please?