First of all thank you all of you.
This example helps me to get string successfully example is close to @Phil,
https://goo.gl/eDv5XDMy database datatype is VarChar, if there is only 8396 than my RadioCode has become empty (But my local Show me 8396 but as i press f8 the Radiocode become Null) however if i Put as you can see in attachment F8396 the result appear in the box. i think i need to convert this PChar to normal String.