How to enhance the admin permission of buttons in WPF

Please try the below  

public bool IsAdminRole { get; set; }

// In the constructor or after authentication
if (userRole == "Admin")
{
    IsAdminRole = true;
}
else
{
    IsAdminRole = false;
}

public bool IsAdminRole { get; set; }

// In the constructor or after authentication
if (userRole == "Admin")
{
    IsAdminRole = true;
}
else
{
    IsAdminRole = false;
}

private void DeleteButton_Click(object sender, RoutedEventArgs e)
{
    if (IsAdminRole)
    {
        // Perform delete action
    }
    else
    {
        MessageBox.Show("You don't have permission to perform this action.");
    }
}