Why can't I remove TextBox text in windows 8.1 app?

Question

How do i remove text from a TextBox in Windows 8.1 App?? Whenever I click on the button, it adds "1" to the textbox :

private void button1_Click(object sender, RoutedEventArgs e)
        {

            textBox1.Text += 1;
        }

But when i use another button to replace/remove all text from textBox, it doesn't remove the text :

private void button0_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Text = "";

        }

I also used textBox1.Text = string.Empty; but nothing happens.

Its a simple calculator windows 8.1 store app, Complete Code is given below :

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238

namespace App3
{
    /// 
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// 
    public sealed partial class MainPage : Page
    {


        public MainPage()
        {
            this.InitializeComponent();



        }

        private void button0_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Text = "";

            //or textBox1.Text = string.Empty; //It also doesn't work!!
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {

            textBox1.Text += 1;
        }

        private void button2_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Text += 2;
        }

        private void button3_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Text += 3;
        }

        private void button5_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Text += 4;
        }

        private void button6_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Text += 5;
        }

        private void button7_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Text += 6;
        }

        private void button9_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Text += 7;
        }

        private void button10_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Text += 8;
        }

        private void button11_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Text += 9;
        }

        private void button13_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Text += 0;
        }

        private void button14_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Text += ".";
        }

        private void button15_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Text += "=";
        }

        private void button4_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Text += "+";
        }

        private void button8_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Text += "-";
        }

        private void button12_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Text += "*";
        }

        private void button16_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Text += "/";
        }

        private void textBox1_TextChanged(object sender, TextChangedEventArgs e)
        {

        }

    }

}

So when I click button0, It does not clear the textbox.

MainPage.xaml:

Why can't I remove TextBox text in windows 8.1 app?

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Why can't I remove TextBox text in windows 8.1 app?