Unable to receive form data using post and action

Question

For some reason when I use the metod="post" action="DisplayForm.aspx" and runat="server" I can't get the data to be displayed on a different page(DisplayForm) the .cs file string is being displayed but without the data from the form. I use regular HTML textboxes and did not finish all the cs file code because it all based on the same thing but the HTML is finished. I don't want to use PHP or JS

form HTML

       <form autocomplete="on" runat="server" method="post" action="DisplayForm.aspx" id="log">

                        <h1>התחבר</h1>
                        <p>
                            <label for="username" class="uname" data-icon="u">שם משתמש: </label>
                            <input name="signinName" required="required" type="text" placeholder="myusername " pattern="{3,}" maxlength="10" oninvalid="this.setCustomValidity('שם משתמש צריך להיות בין 3-10 תווים') " id="signinU" />

                        </p>
                        <p>
                            <label for="password" class="youpasswd" data-icon="p">סיסמה : </label>
                            <input name="password" required="required" type="password" placeholder="eg. X8df!90EO" pattern="{6,8}" maxlength="8" onivalied="this.setCustomValidity('סיסמה צריכה להיות בין 6-8 מספרים') " oninput="SetCustomValidity('')" id="signinP" />
                        </p>
                        <p class="keeplogin">
                            <label for="loginkeeping">השאר אותי מחובר</label>
                            <input type="checkbox" name="loginkeeping" id="loginkeeping" value="loginkeeping" />

                        </p>
                        <% =st %>
                        <p class="login button">
                            <input type="submit" value="התחבר" />
                        </p>
                        <div class="change_link">
                            <p>
                                אין משתמש?
                                <a href="#toregister" class="to_register" id="join">הצטרף</a>
                            </p>
                        </div>
                    </form>

DisplayForm.aspx.cs

    public partial class DisplayForm : System.Web.UI.Page
{
    public string st = "";
    protected void Page_Load(object sender, EventArgs e)
    {
        //Signin vars
        string signUser = Request.Form["signinName"];

        //signup vars
        string loginUser = Request.Form["loginUsername"];

        st += "<p style='postition:absolute;top:20%;z-index:999;'>שלום" + signUser + "</p>";

    }
}

I don't have any code to send the data because as far as I know the method='post' does that. This code does work when I use it in the .cs file of the page where the form is placed so maybe I need to add sending code?.

In the DisplayForm page, there is nothing except the data from the form

Hope I was clear

Thank you in advanced

Answer 1

try

string signUser = Request.Form["signinName"];

instead
string signUser = Request.Form["signinU"];
The request.Form contains the name of the keys of the input rather the ID.