c# - Guid format is not Recognised -


i error in dropdownlist when it's converting string guid.

stack trace: @ system.guid.guidresult.setfailure(parsefailurekind failure, string failuremessageid, object failuremessageformatargument, string failureargumentname, exception innerexception) @ system.guid.tryparseguid(string g, guidstyles flags, guidresult& result) @ system.guid..ctor(string g) @ projects_addproject.wizcreateproject_activestepchanged(object sender, eventargs e) @ system.web.ui.webcontrols.wizard.onactivestepchanged(object source, eventargs e) @ system.web.ui.webcontrols.wizard.multiviewactiveviewchanged(object source, eventargs e) @ system.web.ui.webcontrols.multiview.onactiveviewchanged(eventargs e) @ system.web.ui.webcontrols.multiview.set_activeviewindex(int32 value) @ system.web.ui.webcontrols.wizard.set_activestepindex(int32 value) @ projects_addproject.proxy_navigate(object sender, historyeventargs e) @ system.web.ui.scriptmanager.raisenavigate(historyeventargs e) @ system.web.ui.scriptmanager.loadhistorystate(string serverstate) @ system.web.ui.scriptmanager.raisepostbackevent(string eventargument) @ system.web.ui.scriptmanager.system.web.ui.ipostbackeventhandler.raisepostbackevent(string eventargument)

the method wizcreateproject_activestepchanged. need know how fix conversion.

here method error:

protected void wizcreateproject_activestepchanged(object sender, eventargs e) {     switch (wizcreateproject.activestepindex)     {         case 0:             if (rbfrmtemp.checked)             {                 int tenantid = tenantutils.gettenantid(page);                 ezproject templateproject = dbaccessprojects.getproject(tenantid, new guid(ddlprojtemplates.selectedvalue));         default:             break;     } }

i error in line:

ezproject templateproject = dbaccessprojects.getproject(tenantid, new guid(ddlprojtemplates.selectedvalue));

i checked ddlprojecttemplates have type of vaues 

<option value="7590aab2-29b9-4262-9982-4403ca7b52f2">managed services agreement</option>

is correct guid format. how can fix issue?

my guess drop down list selection being trashed when post , picking first thing in drop down list, empty , guid conversion fails. protect guid conversion have applied values not null or not empty, this:

if(!string.isnullorempty(ddlprojtemplates.selectedvalue)) {     // know there value attempt convert     ezproject templateproject = dbaccessprojects.getproject(tenantid, new guid(ddlprojtemplates.selectedvalue)); }

for greater protection, use guid.tryparse() method instead of guid constructor, this:

guid newguid; if (guid.tryparse(ddlprojtemplates.selectedvalue, out newguid)) {     ezproject templateproject = dbaccessprojects.getproject(tenantid, newguid); }

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