Handling of special characters WEB.FORMS

Personal I need your help.

I'm fiddling with a Web Form system where fields are accepting the special characters as shown in the picture below.

Thefieldsacceptonlythese3#-$-%characters,butyoucannotacceptthem.

Ineedtowithdraw,couldanyonehelpmewiththis?ImovedverylittleinwebformI'mlost.

<divstyle="font-weight: 700">
1. Dados Demográficos</div>

<table id="IdentPaci" style="margin-left:15px; margin-top:10px;">
<tr>
    <td >
        <a style="color:Red;">* </a>a) Peso (Kg)&nbsp;&nbsp;
    </td>
    <td>
        <asp:TextBox ID="pesob" runat="server" BorderColor="#999999" 
            BorderStyle="Solid" MaxLength="6" TabIndex="1" Width="90px"></asp:TextBox>
   </td>
</tr>
<tr>
    <td >
        <a style="color:Red;">* </a>b) Altura (m)</td>
    <td style="text-align:center; font-style: italic;">
        <asp:TextBox ID="alturab" runat="server" BorderColor="#999999" 
            BorderStyle="Solid" MaxLength="4" TabIndex="2" Width="90px"></asp:TextBox>
    </td>
</tr>
<tr>
    <td >
        <a style="color:Red;">* </a>c) Pressão arterial sistólica (mmHg)&nbsp;&nbsp; </td>
    <td style="text-align:center; font-style: italic;">
        <asp:TextBox ID="pasb" runat="server" BorderColor="#999999" 
            BorderStyle="Solid" MaxLength="3" TabIndex="3" Width="90px"></asp:TextBox>
    </td>
</tr>
<tr>
    <td >
        <a style="color:Red;">* </a>d) Pressão arterial diastólica (mmHg)&nbsp;&nbsp;&nbsp; </td>
    <td style="text-align:center; font-style: italic;">
        <asp:TextBox ID="padb" runat="server" BorderColor="#999999" 
            BorderStyle="Solid" MaxLength="3" TabIndex="4" Width="90px"></asp:TextBox>
    </td>
</tr>
<tr>
    <td >
        <a style="color:Red;">*</a>e) Frequência cardíaca (bmp)</td>
    <td style="text-align:center; font-style: italic;">
        <asp:TextBox ID="fcb" runat="server" BorderColor="#999999" 
            BorderStyle="Solid" MaxLength="3" TabIndex="5" Width="90px"></asp:TextBox>
    </td>
</tr>
 </table>
 <table style="margin-left:15px;">
<tr>
    <td  width="290px">
        <a style="color:Red;">*</a>f) Etnia</td>
    <td style="text-align:center; font-style: italic;">
        <table >
            <tr>
                <td>
                    <asp:RadioButtonList ID="racab" runat="server" 
                        RepeatDirection="Horizontal" TabIndex="6">
                        <asp:ListItem Value="1">branca</asp:ListItem>
                        <asp:ListItem Value="2">negra</asp:ListItem>
                        <asp:ListItem Value="3">parda</asp:ListItem>
                        <asp:ListItem Value="4">amarela</asp:ListItem>
                    </asp:RadioButtonList>
                </td>
            </tr>
        </table>
    </td>
</tr>
</table>