html5 required is not allowing button click action to fireup

Question

I have an input page where i want to create some required fields and some aren't. That means that at the first part of the form, you can select the date by pressing a button to show a calender to select the desired date, adding users (by pressing a button) and then you add the required text and finally a submit button.

Right now, when I put the required attribute to the input tag, the first two buttons don't work. They don't fire up and it writes that first I need to insert the required items. How can I remove the connection between those specific buttons and the required inputs?

Thanks, Arkadi.

Code:

<h3> Create New Project</h3>
Users Added: <asp:TextBox ID="TextBox1" runat="server" 
    ReadOnly="True"></asp:TextBox>
<asp:Label ID="lblAdded" runat="server" Text="Label" >User Was Already Added</asp:Label>
<asp:Label ID="lblNotFound" runat="server" Text="Label" >User Was Not Found</asp:Label>
<br />
<asp:CheckBoxList ID="CheckBoxList1" runat="server" AutoPostBack="true" 
    OnSelectedIndexChanged="CheckBoxList1_SelectedIndexChanged"></asp:CheckBoxList>

Add User<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
        <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" /><br /><br />

Project Name: <input ID="txtName" runat="server" required="required" />

Hand Over Date: <asp:TextBox ID="txtHandOverDate" runat="server" ReadOnly="true"></asp:TextBox>
                 <asp:Button ID="btnSelectDate" runat="server" Text="SelectDate" 
             OnClick="btnSelectDate_Click" />
         <asp:Calendar ID="Calendar1" runat="server" Visible="False" 
             OnSelectionChanged="Calendar1_SelectionChanged"></asp:Calendar>

Hand Over Form: <input ID="txtHandOverForm" runat="server" required="required"/>
Subject: <input ID="txtSubjectField" runat="server" required="required" />
Project Porpuse <input ID="txtPorpuse" runat="server" required="required" />
Perimiters<input ID="txtPerimiters" runat="server" required="required" />
Comments <textarea id="txtComments" runat="server"></textarea>

<asp:Button ID="Button2" runat="server" Text="Button" OnClick="Button2_Click" />

Answer 1

I found what I wanted, so to all those who will see this: I just needed to change the type of the button from submit to command, that means adding the attribute UseSubmitBehavior to false.

Thanks for the Answers, this site is great!