ASP.net ajax提交按钮与textBox？

Question

当我点击按钮时，我的代码有什么问题我无法从服务器端部分读取文本框值 我的代码如下：

<form id="form1" runat="server" class="c-form">
<asp:Label ID="zr_message" runat="server" Text=""></asp:Label>
<div>
    <asp:TextBox style="margin:0px;float:left;" ID="zr_tb_hotel_name" runat="server"  placeholder="Hotel Prand Name"></asp:TextBox>
    <asp:RequiredFieldValidator id="RequiredFieldValidator1" runat="server"
        ControlToValidate="zr_tb_hotel_name"            
        ErrorMessage="Hotel Brand Name Field is empty</br>" 
        style="margin:0px;clear:both;display:block;color:Red;"/>
</div>
<div>
    <asp:TextBox style="margin:0px;float:left;" ID="zr_tb_hotel_location" runat="server" placeholder="Hotel Location"></asp:TextBox>
    <asp:RequiredFieldValidator id="RequiredFieldValidator2" runat="server"
            ControlToValidate="zr_tb_hotel_location"            
            ErrorMessage="Hotel Location Field is empty</br>" 
            style="margin:0px;clear:both;display:block;color:Red;"/>
</div>
<div>        
    <asp:Button ID="Button1" runat="server" Text="Button" onclientclick="GetServerDate();return false;" />
    <button id="back" type="reset">Cancel</button>
</div>
</form>

 Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        x_ref = Request.QueryString("ref")

        If (String.Equals(x_ref, "hotel")) Then
            Response.Cache.SetCacheability(HttpCacheability.NoCache)
                GetServerDate()

        End If
    End Sub

Private Sub GetServerDate()`enter code here`
        Response.Clear()
        Response.Write(DateTime.Now.ToString() + "Data =" + zr_tb_hotel_location.Text)
        Response.End()
    End Sub
enter code here