Attaching event handlers to dynamically created controls in ASP.NET (C#)

I have been pulling my hair out for the past few days writing an ASP.NET C# page that dynamically adds controls (textboxes, ddlists, etc) to a form depending on values stored in a database.  The problem I am having is figuring out how to get the data from the controls once the user clicks the submit button.  I have settled on attaching an event to each dynamically generated textbox for when the text of each textbox changes.  Here is my code:

    protected override void OnInit(EventArgs e)
    {
        base.OnInit(e);
        GenerateReportForm();
    }

  protected void GenerateReportForm()
{
     
       //query db for number of textboxes and properties, store results in ReportsDataSet textBoxConrols -- code omitted for simplicity

        foreach (ReportsDataSet.TextBoxRow tbRow in textBoxControls)
        {
            Label tempLabel = new Label();
            tempLabel.Text = tbRow.Label;
            tempLabel.ID = "tbl" + tbRow.ID.ToString();
            TextBox tempTextBox = new TextBox();
            tempTextBox.ID = tbRow.EMfield.ToString();
            tempTextBox.TextChanged += new EventHandler(TextBox_TextChanged);
            form1.Controls.Add(tempLabel);
            form1.Controls.Add(tempTextBox);
            form1.Controls.Add(new LiteralControl("<br>"));
     }

      protected void TextBox_TextChanged(object sender, EventArgs e)
     {
          TextBox tempTextBox = (TextBox)sender;
          Session.Add(tempTextBox.ID.ToString(), tempTextBox.Text.ToString()); //store text into persistent session variable
     }

I don't understand why the TextBox_TextChanged function is not being called after clicking the form's submit button.  Instead, the code for the submit button click handler is run.  Shouldn't the textbox text changed handler run first?  My Page_Load method contains no code.

I would really appreciate anyone's input on this, it has been killing me the past couple days.  Suggestions for a better way to grab dynamically created controls (user input) data would also be work, just need to get the text in those textboxes one way or another!  Thanks!