如何与在C＃中生成的文本框同时创建RequiredFieldValidator？

Question

In C# server side codes, I already successful created a textboxes based on user select how many they want to fill it out. Now I want to created a RequiredFieldValidators to validate these textboxes I generated to ensure that the users doesn't leave the textboxes blank. I don't know how that work but I am sure it need to put inside foreach loop to create validators at the same time as textboxes. Please help

C# codes,

 int num = 1;

        foreach(PSObject psObject in output)
        {
            HtmlGenericControl div = new HtmlGenericControl("div");
            Label ipLabel = new Label();
            ipLabel.Text = psObject + "<br/>";
            TextBox t = new TextBox();
            t.ID = "textBoxName" + num.ToString();
            div.Controls.Add(ipLabel);
            div.Controls.Add(t);
            phDynamicTextBox.Controls.Add(div);
            tbids.Add(t.ID);
            num++;
        }

        Session["tbids"] = tbids;

HTML codes,

<div id="div1" runat="server">
        <asp:PlaceHolder ID="phDynamicTextBox" runat="server" />
        </div>

Answer 1

You just need to create RequiredFieldValidator similar to Label and TextBox control.

Only difference is you need to assign TextBox's ID to ControlToValidate.

...
TextBox t = new TextBox();
t.ID = "textBoxName" + num.ToString();
div.Controls.Add(ipLabel);
div.Controls.Add(t);

var rfv = new RequiredFieldValidator();
rfv.ID = "RequiredFieldValidator" + num;
rfv.ControlToValidate = t.ID;
rfv.ErrorMessage = num + " is required.";
div.Controls.Add(rfv);

phDynamicTextBox.Controls.Add(div);
...

Answer 2

@Win Answer is correct, here is a fancy way to do it:

var textBoxValidator = new RequiredFieldValidator
{
    ID = "textBoxValidator" + num,
    ControlToValidate = t.ID,
    Display = ValidatorDisplay.Dynamic,
    ErrorMessage = String.Format("The TextBox field #{0} Cannot be blank", num),
    ForeColor = Color.Red
};


div.Controls.Add(textBoxValidator);