c# - How to use for loop to scan all controls in ASP .NET page? -

foreach (control ctrl in page.controls)      {         if (ctrl textbox)         {             if (((textbox)(ctrl)).text == "")             {                  helpcalss.messagebox("please fill empty fields", this);                     return;               }           }       }   

i'm using asp.net , have inserting page texboxes , need check if texboxes in page empty , if need show message box empty textbox

here a article on it, below modified version collects controls given property

public list<control> listcontrolcollections(page page, string propertyname) {     list<control> controllist = new list<control>();     addcontrols(page.form.controls, controllist, propertyname);     return controllist; }  private void addcontrols(controlcollection controlcollection, list<control> controllist, string propertyname) {     foreach (control c in controlcollection) {         propertyinfo propertytofind = c.gettype().getproperty(propertyname);          if (propertytofind != null) {             controllist.add(c);         }          if (c.hascontrols()) {             addcontrols(c.controls, controllist, propertyname);         }     } } 

to use it:

list<control> controllist = listcontrolcollections("text"); (i=0; < controllist.length; i++) {    if (controllist[i].text == string.empty)    {       // logic here    }    else      {       // logic here    } }