What is the best way to login my website from another website?

Hi, all:

I have a website with its own login page. Now one of my clients want
their employees log into my website from their website. They want to
have their login page (look and feel are different and hosted on
another web server) and then send the user id and pwd to my login
page. What is the best to do this?

Pass the user id and pwd on the url is not a solution since everybody
will see the user's credential.

We are trying to build their login page like following:

<form action="https://mywebsite/Login.aspx"; id="form1" name="form1"
method="post" action="" style="padding:0; margin:0;">
<input type="hidden" name="__EVENTTARGET" id="__EVENTTARGET"
value="" />
<input type="hidden" name="__EVENTARGUMENT" id="__EVENTARGUMENT"
value="" />
<input name="txtUserID" type="text" size="18" />
<input name="txtPWD" type="password" size="18" />
<input name="Submit" type="submit" style="font-size: 10px;"
value="Login" />
</form>

But we got the error
Invalid postback or callback argument. Event validation is enabled
using <pages enableEventValidation="true"/> in configuration or <%@
Page EnableEventValidation="true" %> in a page.

I do not think Disable Event validation is a good idea.

Is there any other better approach?

Thanks a lot.

.

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