static

i define a configFile class like that class CConfigFile { public: CConfigFile(void); ~CConfigFile(void); static string strLevel; static float gamma; static void Load() { ifstream fin("Config.ini"); // Check if the file was not found or could not be opened if(fin.fail()) { // Display an error message and quit the program if file wasn't found MessageBox(NULL, "Could not find Config.ini file!", "Error", MB_OK); PostQuitMessage(0); return; } // Read in the name of the level that will be loaded fin >> strLevel>>strLevel; string strGamma; // Now we need to read in the gamma level for our lightmaps fin >> strGamma>>gamma; // Close the file fin.close(); } }; whenever i use the static variable gamma or strLevel, there is a link error (no syntax error ) it says that these two variale is unresolved external symbol (LNK2001) what is the reason??