c# - ControlToValidate doesn't work -

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i'm trying add requiredfieldvalidator behind <input>.

the following code:

<form id="form1" runat="server">     <div>         <input type="text" id="mid" />         <asp:requiredfieldvalidator id="requiredfieldvalidator1"              runat="server" errormessage="requiredfieldvalidator"></asp:requiredfieldvalidator>         <br />     </div> </form>

then, i'm trying assign controltovalidate mid, id of input text. however, there isn't available in controltovalidate:

enter image description here

then, type mid in , run program,

<form id="form1" runat="server">     <div>         <input type="text" id="mid" />         <asp:requiredfieldvalidator id="requiredfieldvalidator1"              runat="server" errormessage="requiredfieldvalidator" controltovalidate="mid"></asp:requiredfieldvalidator>         <br />     </div> </form>

and this:
enter image description here

it's been 5 or 6 years since last wrote asp.net website, i'm sure can use server side validators on server side input controls. form doesn't contain server side input controls.
<input type="text" id="mid" /> should asp:textbox tag.





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