如何从文本框的值添加查询字符串？ ASP .NET C＃

Question

I have a login page for a website where members insert their email in a textbox. My question is how to redirect to another page depending on the value of the textbox, for example

Response.Redirect("homepage.aspx?and here the value of the textbox");

Answer 1

keyboardP's answer is the correct one, but please keep in mind the security hole this opens in your site. You need to run that textbox value through all the validation you can to avoid XSS attacks, request hijacking, or any other malicious behavior that can done by simply using the value from a textbox without verifying it.

If this isn't an issue, you should mark keyboardP's answer as the right one.

Answer 2

Response.Redirect(string.Format("homepage.aspx?{0}", myTextbox.Text));

All the code above does is replace {0} with the value of the textbox, which is retrieved using the Text property. The page is then redirected to the newly formed string which contains the textbox value.

As a side note, since I don't know what's in your textbox, you should add an ID for the querystring like this:

string.Format("homepage.aspx?mytextbox={0}", myTextbox.Text)

This makes it easier to retrieve the QueryString from the other side.

EDIT - To receive the QueryString, you handle it on the page that it's being redirected to. In that page, you could do something like this:

protected void Page_Load(object sender, EventArgs e)
{
    //notice that we're using the id `mytextbox`
    string qsvalue = Request.QueryString["mytextbox"];
    if (qsvalue != null)
    {
        ...
    }
}

I'm assuming it's a string, but you can also parse it to other types such as integers if that's what you're expecting.