winforms - How to enable a button that is disabled based on textBox? c# -

i got textbox load value database , button update changes based on value of textbox. need enabled button if textbox value changed. example, value textbox loads 3 if input again 3 in textbox button still disable. button enabled if changed value example 4 or number not 3.

cache original value somewhere compare in textchanged event

    private void textbox1_textchanged(object sender, eventargs e)     {         if (textbox1.text == originalvalue)         {             button1.enabled = false;         }         else          {             button1.enabled = true;         }     } 

alternatively, (see codesinchaos' comment below):

    private void textbox1_textchanged(object sender, eventargs e)     {         button1.enabled = textbox1.text != originalvalue;     }