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'System.InvalidOperationException' occurred in System.Xml.Serialization.ni.dll


'System.InvalidOperationException' occurred in System.Xml.Serialization.ni.dll

By : user2952426
Date : November 19 2020, 01:01 AM
it should still fix some issue I am making a Windows Phone 8.1 Silverlight Application. I want LinkedIn Authentication in it. I got 1-3 samples from internet. but they all are reporting error on same line: , It tells you...
code :
[XmlElement("headline")]
public string Headline { get; set; }

[XmlElement("headline")]
public string Interests { get; set; }
[XmlElement("interests")]
public string Interests { get; set; }


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An exception of type 'System.InvalidOperationException' occurred in System.Web.Mvc.dll but was not handled in user code

An exception of type 'System.InvalidOperationException' occurred in System.Web.Mvc.dll but was not handled in user code


By : hakerz 4u
Date : March 29 2020, 07:55 AM
help you fix your problem This was because of web.config file. You have to specify exact version of packages there. Look here
Update
An exception of type 'System.InvalidOperationException' occurred in System.Web.dll but was not handled in user code

An exception of type 'System.InvalidOperationException' occurred in System.Web.dll but was not handled in user code


By : kozzmen
Date : March 29 2020, 07:55 AM
this one helps. As per this http://www.iis.net/learn/application-frameworks/building-and-running-aspnet-applications/aspnet-20-breaking-changes-on-iis
"You will receive an ASP.NET 500 – Server Error: This method can only be called after the authentication event. HttpRequest.LogonUserIdentity throws an InvalidOperationException when accessed before PostAuthenticateRequest, because the value of this property is unknown until after the client has been authenticated."
code :
protected void Application_OnPostAuthenticateRequest(object sender, EventArgs e)
{
    if (!Request.Path.Contains("NoAccess"))
    {
        //Checks rights to application
        var secData = SecurityProvider.GetSecurityData("TEST", Request.LogonUserIdentity, false);

        var access = new SecurityClient(secData).HasAccess("TEST", SecurityAccessLevel.Read);

        if (!access)
        {
            Response.Redirect("NoAccess");
        }
    } 
}
ExecuteReader- An exception of type 'System.InvalidOperationException' occurred in System.Data.dll but was not handled i

ExecuteReader- An exception of type 'System.InvalidOperationException' occurred in System.Data.dll but was not handled i


By : Mathematics
Date : March 29 2020, 07:55 AM
seems to work fine You have to use SqlDataReader.Read to advance the reader to the next(first) record:
code :
using(var dru = cmddu.ExecuteReader())
{
    if(dru.Read())
    {
        int td1 = (Convert.ToInt16(dru["Hour"]) * 60) + (Convert.ToInt16(dru["Minute"]));      //error shown here[enter image description here][1]
        int td2 = (Convert.ToInt16(dru["Hour1"]) * 60) + (Convert.ToInt16(dru["Minute1"]));
    }
}
MySql - An unhandled exception of type 'System.InvalidOperationException' occurred in System.Data.dll

MySql - An unhandled exception of type 'System.InvalidOperationException' occurred in System.Data.dll


By : Zane Luo
Date : March 29 2020, 07:55 AM
seems to work fine You are missing a critical step. You are not assigning any command to your adapter. It doesn't know how to query anything without a command
code :
Dim adapter As New MySqlDataAdapter(cmd)
Dim cmd As New MySqlCommand("SELECT * FROM `user` 
                            WHERE username=@username 
                            AND `password`=@password", connection)
Private Sub btnLogin_Click(sender As Object, e As EventArgs) Handles btnLogin.Click
Using connection = New MySqlConnection(connStr)
   connection.Open()

   .... all of your code except the close connection

End Using ' this close the connection also in case of exceptions
Dim reader = cmd.ExecuteReader()
if reader.HasRows then
    MessageBox.Show("Login Success!")
Else
    MessageBox.Show("Invalid Username or Password")
End If
'System.InvalidOperationException' occurred in System.Private.CoreLib.dll but was not handled in user code

'System.InvalidOperationException' occurred in System.Private.CoreLib.dll but was not handled in user code


By : user2854013
Date : March 29 2020, 07:55 AM
should help you out
'Session has not been configured for this application or request.'"
code :
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        ...
        app.UseSession(); 
        ... 

        app.UseMvc(routes =>
        {
            routes.MapRoute(
                name: "default",
                template: "{controller=Home}/{action=Index}/{id?}");
        }); 
     }
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