c# - GridCommandEventArgs conversion from Int32 -

what need considerer when convert result of gridcommandeventargs databinder.eval() in int32 (c#)?

for example: there code in .aspx

<%# databinder.eval(container.dataitem, "fielddb")%> 

in aspx.cs have code:

int number = convert.toint32(((radtextbox)e.item.findcontrol("txtfielddb")).text); 

i tried convert.toint32 , int.parse() not worked.

in visual studio error was:

an exception of type 'system.formatexception' occurred in mscorlib.dll not handled in user code 

additional information: input string not in correct format.

but vague.

you error if type that's not convertible integer, since used convert.toint32 or int.parse.

make sure value binding convertible integer.