c# - Linq Data Source WhereParameters with "\" in value -


asp.net/c# project utilizing linq sql have listbox, values database, used filter linq data source. works fine until have value in listbox contain "\". eg "domain\group name". appreciated! 

if (ddlappgroup.selectedvalue != "*")             {                 linqdatasource1.whereparameters.add(new parameter("applicationgroup", system.data.dbtype.int16));                 linqdatasource1.whereparameters["applicationgroup"].defaultvalue = ddlappgroup.selectedvalue;                  if (linqdatasource1.where == "")                 {                     linqdatasource1.where = "applicationgroup == @applicationgroup";                 }                 else                 { linqdatasource1.where = linqdatasource1.where + " && applicationgroup == @applicationgroup"; }             }

this parameters like:

    linqdatasource1.whereparameters[0] {applicationgroup}     convertemptystringtonull: true     dbtype: int16     defaultvalue: "domain\\group-name"     direction: input     name: "applicationgroup"     size: 0     type: empty

and error reported

    {"input string not in correct format."}     [system.formatexception]: {"input string not in correct format."}     data: {system.collections.listdictionaryinternal}     helplink: null     hresult: -2146233033     innerexception: null     message: "input string not in correct format."     source: "mscorlib"     stacktrace: "   @ system.number.stringtonumber(string str, numberstyles options, numberbuffer& number, numberformatinfo info, boolean parsedecimal)\r\n   @ system.number.parseint32(string s, numberstyles style, numberformatinfo info)\r\n   @ system.int16.parse(string s, numberstyles style, numberformatinfo info)\r\n   @ system.string.system.iconvertible.toint16(iformatprovider provider)\r\n   @ system.convert.changetype(object value, typecode typecode, iformatprovider provider)\r\n   @ system.web.ui.webcontrols.parameter.getvalue(object value, string defaultvalue, typecode type, boolean convertemptystringtonull, boolean ignorenullabletypechanges)\r\n   @ system.web.ui.webcontrols.parameter.getvalue(object value, string defaultvalue, dbtype dbtype, boolean convertemptystringtonull, boolean ignorenullabletypechanges)\r\n   @ system.web.ui.webcontrols.parameter.getvalue(object value, boolean ignorenullabletypechanges)\r\n   @ system.web.ui.webcontrols.parameter.get_parametervalue()\r\n   @ system.we b.ui.webcontrols.parametercollection.getvalues(httpcontext context, control control)\r\n   @ system.web.ui.webcontrols.queryabledatasourceview.createquerycontext(datasourceselectarguments arguments)\r\n   @ system.web.ui.webcontrols.linqdatasourceview.executeselect(datasourceselectarguments arguments)\r\n   @ system.web.ui.datasourceview.select(datasourceselectarguments arguments, datasourceviewselectcallback callback)\r\n   @ system.web.ui.webcontrols.databoundcontrol.performselect()\r\n   @ system.web.ui.webcontrols.basedataboundcontrol.databind()\r\n   @ system.web.ui.webcontrols.gridview.databind()\r\n   @ pyocenrollment.admin.allrequests.btnapply_click(object sender, eventargs e) in c:\\projects\\pyocenrollment\\pyocenrollment\\eue\\allrequests.aspx.cs:line 265"     targetsite: {void stringtonumber(system.string, system.globalization.numberstyles, numberbuffer byref, system.globalization.numberformatinfo, boolean)}

this not going fly:

dbtype: int16 defaultvalue: "domain\\group-name"

consider changing dbtype 1 of nvarchar types.


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