I am unable to call ajax method

Hello when i am calling this function showing error in---

$.ajax({
"form1" runat="server">
Register Vendor
class="form-group">
"server" ID="txtfirstname" MaxLength="20" type="text" placeholder="First Name" class="form-control"
onkeyDown="checkTextAreaMaxLength(this,event,'20');" />
"server" ID="txtlastname" MaxLength="30" type="text" placeholder="Last Name" class="form-control"
onkeyDown="checkTextAreaMaxLength(this,event,'30');" />
<%--"server" ControlToValidate="txtfirstname" Display="None" ValidationGroup="vendorSignup" ErrorMessage="First Name is required !">
"server" ControlToValidate="txtlastname" Display="None" ValidationGroup="vendorSignup" ErrorMessage="Last Name is required !">--%>

class="form-wrapper">

"server" ID="txtusername" MaxLength="35" type="text" placeholder="Username" class="form-control"

onkeyDown="checkTextAreaMaxLength(this,event,'35');" />

<%--"server" ControlToValidate="txtusername" Display="None" ValidationGroup="vendorSignup" ErrorMessage="Username is required !">--%>

class="zmdi zmdi-account">

class="form-wrapper">

"server" ID="txtemail" MaxLength="40" type="emil" placeholder="Email ID" class="form-control"

onkeyDown="checkTextAreaMaxLength(this,event,'40');" />

<%--"server" ControlToValidate="txtemail" Display="None" ValidationGroup="vendorSignup" ErrorMessage="Email ID is required !">--%>

class="zmdi zmdi-email">

There are two rules or better say constraints, to use Ajax in webforms

1.The Method must be static.

2.The method must be a web method means marked with WebMethod attribute.

one additional thing your page or master page must have a reference of Jquery.

example

Please test that your method is a web method or not and it is static or not.

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