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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 > 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& m, MouseButtons button, Int32 clicks)

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