AjaxControlToolkit.ComboBox.LoadPostData "Input string was not in a correct format" RSS

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  SnehaAgrawal

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  AjaxControlToolkit.ComboBox.LoadPostData "Input string was not in a correct format"

  Mar 07, 2017 06:31 AM|SnehaAgrawal|LINK

  When I submit a form which consists of AjaxToolKit ComboBox I was getting following error

  [FormatException: Input string was not in a correct format.]
     System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +7469351
     System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +119
     AjaxControlToolkit.ComboBox.LoadPostData(String postDataKey, NameValueCollection postCollection) +177
     AjaxControlToolkit.ComboBox.System.Web.UI.IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection) +36
     System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad) +693
     System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1743

  I saw many forums where developers faced the similar issue but I could not find a proper solution for it, 

  So then I looked into the code of ComboBox.LoadPostData in AjaxControlToolkit.dll .

  Inside LoadPostData we have Convert.Int32 which is throwing error when its not able to convert, To fix that I overrided LoadPostData method in my code and added below check.

  protected override bool LoadPostData(string postDataKey, NameValueCollection postCollection)
  {
  //Overriding AjaxControlToolkit method as Int32.Parse in base method was throwing exception.
  logger.Debug("Inside overriden LoadPostData");
  string[] values = postCollection.GetValues(this.HiddenFieldControl.UniqueID);
  if (values == null)
  {
  return false;
  }

  int num;
  if (int.TryParse(values[0], out num))
  {
  bool value = base.LoadPostData(postDataKey, postCollection);
  return value;
  }else

  {
  return false;
  }
  }

  This works fine for me now.

  If facing similar issue try the same :)