c# - Update display label when changed numericupdown value and button click -

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i have nested loop project have display triangle asterisks getting value numericupdown control , displaybutton click. well, work, displays correct shape , number of stars.

but when try change value numericupdown control, display label not update, instead, add underneath previous result. need display label update/change when value changed numericupdown, , when displaybutton clicked. 

private void displaybutton_click(object sender, eventargs e)     {              if (radiobutton1.checked == true)             {                  int counter = (int)sidelengthnumericupdown.value;                 (int r = 0; r < counter; r++)                 {                     (int c = 0; c <= r; c++)                     {                         displaylabel.text += counter.tostring("*");                      }                     displaylabel.text += counter.tostring("\n");                 }             }             else if (radiobutton2.checked == true)             {                  int counter = (int)sidelengthnumericupdown.value;                 (int r = counter; r > 0; r--)                 {                     (int c = 0; c < r; c++)                     {                         displaylabel.text += counter.tostring("*");                      }                     displaylabel.text += counter.tostring("\n");                 }             }


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