Observer attentivement les déclaration de formulaire, mais actions sont changé automatiquement pour une raison que je ne comprend pas

Voici mon code source:
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Login</title>
</head>
<body>
    <form id="formu" action="login.aspx" runat="server" method="post"  >
    <div align="center" >
        &nbsp;
        <table style="width: 736px; height: 298px">
            <tr>
                <td style="width: 231px; height: 153px">
                </td>
                <td style="width: 246px; height: 153px" align="center">
                </td>
                <td style="width: 229px; height: 153px">
                </td>
            </tr>
            <tr>
                <td style="width: 231px; height: 34px">
                </td>
                <td style="width: 246px; height: 34px" align="center">
                    Utilisateur<asp:TextBox ID="utilisateur" runat="server"></asp:TextBox></td>
                <td style="width: 229px; height: 34px">
                </td>
            </tr>
            <tr>
                <td style="width: 231px; height: 36px">
                </td>
                <td style="width: 246px; height: 36px" align="center">
                    Password<asp:TextBox ID="password" runat="server"></asp:TextBox></td>
                <td style="width: 229px; height: 36px">
                </td>
            </tr>
            <tr>
                <td style="width: 231px; height: 36px">
                </td>
                <td style="width: 246px; height: 36px" align="center">
                    <asp:Button runat="server" ID="submit" Text="Login" /><input type="submit" name="Submit" value="OK" /></td>
 
                <td style="width: 229px; height: 36px">
                </td>
            </tr>
        </table>
    </div>
    </form>
</body>
</html>
Voici ce que le code source du navigateur affiche
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml" >
<head><title>
	Login
</title></head>
<body>
    <form name="formu" method="post" action="Default.aspx" id="formu">
<div>
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwULLTExNTc2NTI3OTlkZFDH+nZzdKobGAXw5IcYBRU3ZZBY" />
</div>
 
    <div align="center" >
        &nbsp;
        <table style="width: 736px; height: 298px">
            <tr>
                <td style="width: 231px; height: 153px">
                </td>
                <td style="width: 246px; height: 153px" align="center">
                </td>
                <td style="width: 229px; height: 153px">
                </td>
            </tr>
            <tr>
                <td style="width: 231px; height: 34px">
                </td>
                <td style="width: 246px; height: 34px" align="center">
                    Utilisateur<input name="utilisateur" type="text" id="utilisateur" /></td>
                <td style="width: 229px; height: 34px">
                </td>
            </tr>
            <tr>
                <td style="width: 231px; height: 36px">
                </td>
                <td style="width: 246px; height: 36px" align="center">
                    Password<input name="password" type="text" id="password" /></td>
                <td style="width: 229px; height: 36px">
                </td>
            </tr>
            <tr>
                <td style="width: 231px; height: 36px">
                </td>
                <td style="width: 246px; height: 36px" align="center">
                    <input type="submit" name="submit" value="Login" id="submit" /><input type="submit" name="Submit" value="OK" /></td>
 
                <td style="width: 229px; height: 36px">
                </td>
            </tr>
        </table>
    </div>
 
<div>
 
	<input type="hidden" name="__EVENTVALIDATION" id="__EVENTVALIDATION" value="/wEWBALsmcGuAQLKorzXCQLyveCRDwLcu4S2BEPCwR+0Elxpzx/FeoBbnfnB9sdV" />
</div></form>
</body>
</html>