We can create the dynamic control in the Page_Init() event or Page_Load() event,

protected void Page_Load(object sender, EventArgs e)

{

TextBox dynamicTextBox = new TextBox();

dynamicTextBox.ID = "DynamicTextBox";

dynamicTextBox.AutoPostBack = true;

dynamicTextBox.Text = "InitData";

dynamicTextBox.TextChanged += new EventHandler(dynamicTextBox_TextChanged);

this.Form.Controls.Add(dynamicTextBox);

}

void dynamicTextBox_TextChanged(object sender, EventArgs e)

{

Response.Write("hello");

}