无法调用ASP.net中的按钮的功能

Question

I am adding textboxes and buttons programmatically, depending on the count of an array from the result of sql.

I want to call a function(deleteButton_Click) for when each textbox change or when the delete button is pressed for each textbox.

When I press the button, the page reloads (I am using context handler to retrieve some data from a previous page)

here is a portion of my code, i can include the whole thing if needed. Ideas?

for(int i = 0; i < alMakers.Count; i++)
    {
        Label labLabel = new Label();
        labLabel.Text = "Lab" + (i + 1);

        labPanel.Controls.Add(labLabel);

        TextBox labs = new TextBox();
        labs.ID = "lab" + i;
        //labs.TextChanged += deleteLab;
        labPanel.Controls.Add(labs);
        labs.Text = labsList.GetValue(i).ToString();

        Button deleteButton = new Button();
        deleteButton.Text = "Delete";
        deleteButton.Click += deleteButton_Click;
        labPanel.Controls.Add(deleteButton);

        //form1.Controls.Add();


    }

here is a portion of my pageload from when I retreive the item from the previous page.

protected void Page_Load(object sender, EventArgs e)
    {
        string studentID;
        if (!IsPostBack)
        {
            Page lastPage = (Page)Context.Handler;
            studentID = ((TextBox)lastPage.FindControl("editStudent")).Text;
            Label1.Text = studentID;

EDIT: My deleteButton_Click function (doesnt do anything as of yet, only changes the text of a label to "Hello")

protected void deleteButton_Click(object sender, EventArgs e)
    {
        Label2.Text = "Hello";
    }

Answer 1

In WebForms, control events such as a button click cause the page to completely reload. When that happens, you're starting over from scratch, and must recreate the buttons. It sounds like you may have realized that much already. Additionally, control events in ASP.Net Webforms rely on ViewState. By the time the Page_Load runs, the ViewState has already finished loading. If you wait that long to recreate your buttons, it's too late to wire up the event handler for the button.

In order your click event to fire, you need to create your buttons at an earlier point in the page lifecycle , before the ViewState loads, such as Page_Init.