Problem with Export To excel button event multiple times


add the following script it  will help to keep old record after export to excel


//< //script type="text/javascript" language="javascript" //>//

    //sharepoint postback to work after clicking on export to excel button

    if (typeof (_spBodyOnLoadFunctionNames) != 'undefined' &&
                                           _spBodyOnLoadFunctionNames != null) {
        _spBodyOnLoadFunctionNames.push("supressSubmitWraper");

    }

    function supressSubmitWraper() {

        _spSuppressFormOnSubmitWrapper = true;

    }
//<//  /script //>//

Creating a Custom ASP.NET (ASMX) Web Service in SharePoint 2010

Get selected users from people picker

 SPFieldUserValueCollection usercoll = new SPFieldUserValueCollection();
                    for (int i = 0; i <= this.peoplepickerid.ResolvedEntities.Count - 1; i++)
                    {
                        PickerEntity parentity = (PickerEntity)this.peoplepickerid.ResolvedEntities[i];
                        usercoll.Add(new SPFieldUserValue(oweb, Convert.ToInt32(parentity.EntityData["SPUserID"]), parentity.Key));
                    }




string selecteduservalue=usercoll;