Server Error in '/' Application.

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Line 523:        //		m_has_expired = dr["has_expired"].ToString();
Line 524:
Line 525:        m_rate = dr["m_discount_rate"].ToString();
Line 526:
Line 527:        //decode the apostrophe to display in text box

[ArgumentException: Column 'm_discount_rate' does not belong to table .]
   System.Data.DataRow.GetDataColumn(String columnName) +3103741
   System.Data.DataRow.get_Item(String columnName) +18
   ASP.register_aspx.DrawCardTable(DataRow dr, Boolean bNew, String newType) in d:\html\AppHost\lawz\cs\card_function.cs:525
   ASP.register_aspx.ShowUserForm(String reg) in d:\html\AppHost\lawz\cs\register.cs:350
   ASP.register_aspx.GetQueryString() in d:\html\AppHost\lawz\cs\register.cs:228
   ASP.register_aspx.Page_Load(Object Src, EventArgs E) in d:\html\AppHost\lawz\cs\register.cs:140
   System.Web.UI.Control.OnLoad(EventArgs e) +108
   System.Web.UI.Control.LoadRecursive() +90
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1533