C# window application checkboxlist selection mode one not working -

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i have window application. now, @ run time adding 1 page & checkboxlist inside of page.

for code is:

form inputbox = new form();                  inputbox.formborderstyle = system.windows.forms.formborderstyle.fixeddialog;                 inputbox.clientsize = size;                 inputbox.text = "doc selection";                 inputbox.startposition = formstartposition.centerscreen;                 inputbox.controlbox = false;                  system.windows.forms.checkedlistbox doctypechklist = new checkedlistbox();                 doctypechklist.location = new system.drawing.point(15, 10);                 doctypechklist.font = new system.drawing.font("microsoft sans serif", 12f, system.drawing.fontstyle.regular, system.drawing.graphicsunit.point, ((byte)(0)));                 doctypechklist.items.add("b");                 doctypechklist.items.add("p");                 doctypechklist.items.add("other");                 doctypechklist.selectionmode = selectionmode.one;                 inputbox.controls.add(doctypechklist);

now, @ run time user can check multi check box...i want @ time 1 checkbox should check instead of multi....i gave selection mode "one" ..

can let me know.what missing????

thanks

checkedlistbox allows user check multi-checkboxes , that's purpose of designing control. selectionmode indicate can select 1 or more items (an item considered selected if it's hightlighted not checked). work-around have add code handle itemcheck event. mechanism simple.

    int lastcheckedindex = -1;     //itemcheck event handler checkedlistbox1     private void checkedlistbox1_itemcheck(object sender, itemcheckeventargs e)     {         if (e.index != lastcheckedindex)         {             if(lastcheckedindex != -1)                checkedlistbox1.setitemcheckstate(lastcheckedindex, checkstate.unchecked);             lastcheckedindex = e.index;         }     }     //to register event     checkedlistbox1.itemcheck += checkedlistbox1_itemcheck;

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