I want to post form fields from my web page into salesforce via web to lead and also in my local database. Can anyone show me how to do this with .Net mvc c# ? I have common fields like user name,email,phone etc
Please look at my code here

<script type="text/javascript">
function submitPractice() {
webToLead({
oid: '00D20000000l2qZ'
//,debug:1
//, debugEmail: 'gerald@ghanafx.com'
, first_name: $("#PracticeUserDetail_FirstName").val()
, last_name: $("#PracticeUserDetail_LastName").val()
, email: $("#Email").val()
, country_code: $("#PracticeUserDetail_Country").val()
, lead_source: 'web demo'
, description: 'This is an automated transparent lead'
});

//practiceform
var formData = JSON.stringify($("#practiceform").serializeArray());
$.ajax({
type: "POST",
url: "/Account/Practice",
data: formData,
success: function () { },
dataType: "json",
contentType: "application/json"
});

}
function webToLead(fields) {
var customHiddenIframeName='JLA_API';
if(!document.getElementById(customHiddenIframeName)){
var theiFrame=document.createElement("iframe");
theiFrame.id=customHiddenIframeName;
theiFrame.name=customHiddenIframeName;
theiFrame.src='about:blank';
theiFrame.style.display='none';
document.body.appendChild(theiFrame);
}
fields['retURL'] = 'http://166.62.127.6/';//dummy URL
var form = document.createElement("form");
form.method = "POST";
form.action = "https://webto.salesforce.com/servlet/servlet.WebToLead?encoding=UTF-8";
form.setAttribute("target", customHiddenIframeName);
for (var fieldName in fields) {
var theInput = document.createElement("input");
theInput.name=fieldName;
theInput.value=fields[fieldName];
theInput.setAttribute("type", "hidden");
form.appendChild(theInput);
}
document.body.appendChild(form);
form.submit();
}
</script>