如何在C＃中避免文本框中的空间

Question

here is my HTML: I  want to avoid any white space in this text box.
 <div class="input-box">
 <asp:TextBox ID="txtPassward"  type="text" runat="server"></asp:TextBox>                         
 </div>
 <div class="actions">                                                       
 <asp:Button ID="Button1" runat="server"  Text="save" OnClick="btnSave_Click" />                             
  </div>

如何在C＃中避免在此文本框中出现空格