Some time ago I moved my ASP.NET 4.5.2 site to the Windows Server with IIS (Internet Information Service). Right after installation I got the following error:

HTTP Error 500.19 - Internal Server Error
The requested page cannot be accessed because the related configuration data for the page is invalid.

Solution

1. First, Open IIS Manager, select root node( the hosting server)
2. In the middle panel double click Feature Delegation.
3. In right panel select "Custom Site Delegation... " In upper part of middle panel
4. click the drop down list and select your site.
5. In Action panel click Reset All Delegation.

Sometimes we need to do fill DropDownList using JQuery & Generic Handler in ASP.NET 4.5.2. You can see this in the example below:

Design Page:
<asp:DropDownList ID=”ddlState” runat=”server” OnPreRender=”ddlState_PreRender”
CssClass=”choose_dropdown”>
<asp:ListItem Value=”0″>SELECT YOUR STATE</asp:ListItem>
</asp:DropDownList>
<asp:DropDownList ID=”ddlProduct” runat=”server”
CssClass=”choose_dropdown”>
</asp:DropDownList>

Generic Handler:
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = “application/json”;
int id = Convert.ToInt32(context.Request["id"]);
string sJSON = GetProduct(id);
context.Response.Write(sJSON);
}
public string GetProduct(int id)
{
ProductController objPrductCont = new ProductController();//My Class Name
//GetProductsByStateID(id) = It will Give All Record On The Basis Of ID
List<ProductInfo> objProduct = objPrductCont.GetProductsByStateID(id);
//Converting Object into JSON
System.Web.Script.Serialization.JavaScriptSerializer oSerializer =
new System.Web.Script.Serialization.JavaScriptSerializer();
string sJSON = oSerializer.Serialize(objProduct);
return sJSON;
}

JQuery Script:
$(“select[id$=ddlState]“).change(function () {
var statVal = $(“select[id$=ddlState]“).val();
if (statVal != “SELECT YOUR STATE”) {
var id = statVal = $(“select[id$=ddlState]“).val();// You will get the value of selected item
$.post(“/CallHandler.ashx”, { id: id }, function (result) {
$(“select[id$=ddlProduct]“).empty();
$(“select[id$=ddlProduct]“).removeAttr(“disabled”);
$(“select[id$=ddlProduct]“).attr(“style”, “cursor:default”);
$(“select[id$=ddlProduct]“).append($(“<option></option>”).val(0).html(“SELECT YOUR PRODUCT”));
$(result).each(function (i) {
$(“select[id$=ddlProduct]“).append($(“<option></option>”).val(result[i].Id).html(result[i].ProductName));
});
});
}
else {
$(“select[id$=ddlProduct]“).empty();
$(“select[id$=ddlProduct]“).append($(“<option></option>”).val(0).html(“SELECT YOUR PRODUCT”));
$(“select[id$=ddlProduct]“).attr(“disabled”, “disabled”);
return false;
}
});

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Have you encountered the error “Binding failure error - "Cannot start the website because administrative privileges are required to bind to the host name or port" while starting to debug your ASP.NET web application?

PROBLEM
I had one simple web app, created with the MVC5 C# template, which worked all okay until few days. Suddenly, when try to start up I got a message "Cannot start the website because administrative privileges are required to bind to the host name or port" The project was created with Visual Studio 2013 before last update version 3. also I try tried to start project in Visual Studio 2012 and that was also unsuccessful.

SOLVING
1. Close your Visual Studio solution and go to your project’s folder and find the CSPROJ file.
2. Open it using your favorite text editor and find the following lines
3.  Search for these two lines and DELETE them:

<DevelopmentServerPort>0</DevelopmentServerPort>

<IISUrl>http://localhost:57680/</IISUrl>

4. Save CSPROJ file
5. Open your solution again and start debugging. You should now be able to debug your web application.

Let me know if this solution for the issue  “Binding failure error – Cannot start the website because administrative privileges are required to bind to the hostname or port” works for you.

Assembly Binding Redirect is a .NET mechanism allowing developers whose application was compiled against a certain strongly-named assembly version to swap that assembly with a different version without recompiling the entire assembly. One of the methods for achieving this goal is by placing a special directive in the application’s configuration file.

.NET Ignoring Assembly Binding Redirect

An example of such a configuration section can be seen below:

<configuration>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="myAssembly" publicKeyToken="1234abcd1234abcd"
          culture="neutral" />
        <bindingRedirect oldVersion="1.0.0.0" newVersion="1.1.0.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
</configuration>

Though it just a simple configuration section, it’s hard for me to fix it such a section which for some reason did not appear to be having any effect on the .NET runtime’s behavior. After quite some time using the Assembly Binding Log Viewer trying to identify the issue, I finally figured it out.

I Just Edited into like this:

<configuration>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="myAssembly" PublicKeyToken="1234abcd1234abcd"
          culture="neutral" />
        <bindingRedirect oldVersion="1.0.0.0" newVersion="1.1.0.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
</configuration>

Can you spot the difference? The “p” in “publicKeyToken” was accidentally written as a capital letter, resulting in no errors thrown by the .NET framework, but plenty of frustration for me seeing that the above section does not do anything.

Conclusion

The .NET framework configuration is intolerant of typos on the one hand (the configuration won’t work) but it doesn’t warn you about it either. If something doesn’t work for no apparent reason, this is definitely a possible reason.

This may be a simple problem but you may got yourself frustrated for only one little mistake such a typo. Just a few lines in my example, but if you had a hundred of lines you don’t even want to make any mistake. How tiny is that.

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About Company
HostForLIFE.eu is European Windows Hosting Provider which focuses on Windows Platform only. We deliver on-demand hosting solutions including Shared hosting, Reseller Hosting, Cloud Hosting, Dedicated Servers, and IT as a Service for companies of all sizes.