Blog Posts List

0x800a139e – Syntax error, unrecognized expression (FIX)

by Yugolancer

Posted on August 13, 2016

Usually you get this error when you run an ASP.NET (Visual Studio 2kxx) Project having focus on a file that cannot be ran.

For instance if you edit your web.config and then just hit F5 key. JQuery will try to parse the url and as you guess it’s going to thrown an exception:

// e.g. 

Fix: just open another file (view or page in design or code view) and re-run the project. Voila!

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ASP.NET MVC AJAX request returns an Internal Server Error (FIX)

by Yugolancer

Posted on June 25, 2016

Usually you get this error if you have the data misspelled e.g. say that your ActionResult expects a param named userid while you are sending user (without id)

public ActionResult AddComment(string productid, string userid, string comment){
  // add the new comment and return Json response

            var data = {};
            data.productid = @ViewBag.ProductID;
            data.user = @ViewBag.UserID;
            data.comment = $('#CommentText').val();
                url: '/Product/AddComment',
                type: "POST",
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                data: JSON.stringify(data),
                success: function (result) {
                    alert("The new comment '" + result.comment + "' has been added successfully!");
                error: function (status, ex) {
                    alert("Error Code: Status: " + status.statusText + " Ex: " + ex);

meaning it is expecting data.userid and you send data.user :(

As you guess just change the data.user to data.userid and it will work as expected.


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Remove Server Header Attribute In IIS 10.0


Posted on January 16, 2019

There is another way to do the same but if you want the simplest one please add the following to the web.config into the system.webServer section:

< rewrite >
    < outboundRules rewriteBeforeCache="true" >
	    < rule name="Remove Server header" >
            < match serverVariable="RESPONSE_Server" pattern=".+" / >
            < action type="Rewrite" value="Your Text Here" / >
        < / rule >
    < / outboundRules > 
< / rewrite >

< customHeaders >		
    < remove name="X-Powered-By" / >
< / customHeaders >


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