Dynamic textbox type problem?

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C#

I created dynamic textbox control

I want to do if you enter a string I will convert it to an integer value, but it gives me "Invalid cast from 'DateTime' to 'Int32'".
I entered 234 into the textboox, but textbox sees datetime. Why?

I think when I create a dynamic textbox control I should specify the textbox's control type.

Thanks your time!


Code:

TextBox txtSayi = new TextBox();
Button btnHesapla = new Button();
Label lblYazi = new Label();
this.Controls.Add(btnHesapla);
this.Controls.Add(txtSayi);
this.Controls.Add(lblYazi);


txtSayi.Location = new Point(100, 150);

lblYazi.Location = new Point(100, 100);
btnHesapla.Text = "HESAPLA";
btnHesapla.Location = new Point(100, 200);
btnHesapla.Size = new Size(20, 20);
btnHesapla.Width = 150;
btnHesapla.Height = 50;
btnHesapla.FlatStyle = FlatStyle.Flat;

btnHesapla.Click += new EventHandler(btnHesapla_Click);

This is the button click handler:

void btnHesapla_Click(object sender, EventArgs e)
{
    int deg = Convert.ToInt32(txtSayi);gives me an error here
    int yuzler, onlar, birler;
    string yuzz, onn, birr;

    yuzler = (((deg) / 100) * 100);
    yuzz = cevir(yuzler);
    onlar = (((deg) / 10) * 10) - yuzler;
    onn = cevir(onlar);
    birler = ((deg) % 10);
    birr = cevir(birler);
    lblYazi = yuzz + " " + onn + " " + birr;
}