C Error The type initializer for threw an exception

Question

This error occurs only in some computers  By reading the stack information  there is some problem when I call to this static method   FormatQuery   in a static class   using System  using System Collections Generic  using System Data  using System Diagnostics  using System IO  using System Text  using System Windows Forms  using DevExpress XtraEditors  using FlexCel Report  using FlexCel XlsAdapter  using ComboBox System Windows Forms ComboBox   namespace XSoftArt A       static class RHelper               private static string FormatQuery string FieldName  int Count              CheckedListBox chekedListBox                        string ID   string Empty              int n   Count               foreach  DataRowView item in chekedListBox CheckedItems                                ID   ID   item      FieldName                        if  n  gt  1                                        ID   ID                              n--                                              return ID                     public static string FormatQuery CheckedListBox chekedListBox                        return FormatQuery chekedListBox ValueMember                  chekedListBox CheckedItems Count  chekedListBox                     So  what s the problem  How do I solve it  Is there something wrong with the project configuration or debbuging mode or what   Error information      at XSoftArt EVS ReportHelper FormatQuery CheckedListBox chekedListBox     at XSoftArt EVS NewEmailSelectClient LoadList v2 String search  TextBox txtbox     at XSoftArt EVS NewEmailSelectClient LoadContacts      at XSoftArt EVS NewEmailSelectClient button7 Click Object sender  EventArgs e     at System Windows Forms Control OnClick EventArgs e     at System Windows Forms Button OnClick EventArgs e     at System Windows Forms Button OnMouseUp MouseEventArgs mevent     at System Windows Forms Control WmMouseUp Message amp  m  MouseButtons button  Int32 clicks     at System Windows Forms Control WndProc Message amp  m     at System Windows Forms ButtonBase WndProc Message amp  m     at System Windows Forms Button WndProc Message amp  m     at System Windows Forms Control ControlNativeWindow OnMessage Message amp  m     at System Windows Forms Control ControlNativeWindow WndProc Message amp  m     at System Windows Forms NativeWindow Callback IntPtr hWnd  Int32 msg  IntPtr wparam  IntPtr lparam

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If you have web services  check your URL pointing to the service  I had a simular issue which was fixed when I changed my web service URL

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This error was generated for me by having an incorrectly formatted NLog config file

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This problem can occur if a class tries to get value of a non-existent key in web config   For example  the class has a static variable ClientID  private static string ClientID   System Configuration ConfigurationSettings AppSettings  GoogleCalendarApplicationClientID   ToString      but the web config doesn t contain the  GoogleCalendarApplicationClientID  key  then the error will be thrown on any static function call or any class instance creation

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I had this problem and like Anderson Imes said it had to do with app settings  My problem was the scope of one of my settings was set to  User  when it should have been  Application

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I got this error when I modified an Nlog configuration file and didn t format the XML correctly

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This can be caused by not having administrator permissions for Oracle Client  Add this in App config file    lt IPermission class  Oracle DataAccess Client OraclePermission   Oracle DataAccess  Version 2 111 7 20  Culture neutral   PublicKeyToken 89b483f429c47342  version   1  Unrestricted  true   gt

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I got this error when trying to log to an NLog target that no longer existed

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I had the same error but in my case it was caused by mismatch in platform target settings  One library was set specifically to x86 while the main application was set to  Any    and then I moved my development to an x64 laptop

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I got this error with my own code   My problem was that I had duplicate keys in the config file

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A Type Initializer exception indicates that the type couldn t be created   This would occur typically right before your call to your method when you simply reference that class   Is the code you have here the complete text of your type   I would be looking for something like an assignment to fail   I see this a lot with getting app settings and things of that nature   static class RHelper          If this line of code failed  you d get this error      static string mySetting   Settings MySetting       You can also see this with static constructors for types   In any case  is there any more to this class

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I tried your code   CheckedListBox cb   new CheckedListBox    for  var i   1  i  lt  11  i      cb Items Add  Item     i  i   3    0    string fmt   RHelper FormatQuery cb   Console WriteLine fmt   Console ReadLine      It threw an exception at this line   foreach  DataRowView item in chekedListBox CheckedItems      Unable to cast object of type  System String  to type  System Data DataRowView     Maybe you are also facing the same kind of problem  Instead of casting to DataRowView  try making the following changes   foreach  var item in chekedListBox CheckedItems        ID   ID   item ToString       item      FieldName          Because items in CheckedListBox are of object type

[c#] C# Error "The type initializer for ... threw an exception

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