windows - C# Random method -

i developed 1 program, whats generates random numbers , letters , after write result xml file. there problem like, if press button generate once, doesn't anything, if press button second time in arrow generates.

private static void toxml(string xml_uri, string value) {     xdocument doc;     if (file.exists(xml_uri))         doc = xdocument.load(xml_uri);     else         doc = new xdocument(new xdeclaration("1.0", "utf-8", "yes"), new xelement("rndstr"));      doc.element("rndstr").add(new xelement("str", value));      doc.save(xml_uri); }  private void button1_click(object sender, eventargs e) {     string file_name = "file.xml";      if (textbox1.text.length > 0)         toxml(file_name, textbox1.text);      textbox1.text = rndstr(10); } 

   if (textbox1.text.length > 0)         toxml(file_name, textbox1.text);      textbox1.text = rndstr(10); 

with current information gave. can on first clicking of button textbox1.text.length = 0 because setting text after executing check length , toxml method. put textbox1.text = rndstr(10); on if check , should happen on first click.

on second click value of text property set value of first click , because of working on second click. next time use debug lot in future. search articles in web debugging.