My Aspx Fields like...

<asp:TextBox ID="txt_title" runat="server" CssClass="form-control" TextMode="SingleLine" placeholder="Alphabets 5 Chars only" MaxLength="5" Width="200px" ></asp:TextBox>
<asp:TextBox ID="txt_Name" runat="server" CssClass="form-control" TextMode="SingleLine" placeholder="Alphabets 70 Chars only" MaxLength="100" Width="200px" ></asp:TextBox>
<asp:TextBox ID="txt_mobile" runat="server" CssClass="form-control" TextMode="SingleLine" placeholder="Alphabets 10 Chars only" MaxLength="10" Width="200px" ></asp:TextBox>
<asp:FileUpload ID="f_Proof" runat="server" accept=".jpg,.jpeg,.pdf" />