c# - Disable Space key on Windows Phone -

i have text box user shouldn't allowed write spaces in.

so far have code:

private void searchcriteria_keydown(object sender, system.windows.input.keyeventargs e) {     if (e.key.tostring() == "space")     {         dellast = searchcriteria.text;         needstodelete = true;     } }  private void searchcriteria_keyup(object sender, system.windows.input.keyeventargs e) {     if (needstodelete == true)     {         searchcriteria.text = dellast;         needstodelete = false;     } } 

it works, cursor being placed in front of text. there way this?

save selectionstart in onkeydown event , set again within onkeyupevent

private void searchcriteria_keydown(object sender, system.windows.input.keyeventargs e {     if (e.key.tostring() == "space")     {         dellast = searchcriteria.text;         needstodelete = true;         _selectionstart = searchcriteria.selectionstart;     } } private void searchcriteria_keyup(object sender, system.windows.input.keyeventargs e) {     if (needstodelete == true)     {         searchcriteria.text = dellast;         searchcriteria.selectionstart = _selectionstart;         needstodelete = false;     } }