     }</div>
<div class="line"><span class="lineno">  579</span>            <span class="keywordflow">else</span></div>
<div class="line"><span class="lineno">  580</span>            {</div>
<div class="line"><span class="lineno">  581</span>                textBox1.Value = 0;</div>
<div class="line"><span class="lineno">  582</span>                textBox1.BackColor = Color.White;</div>
<div class="line"><span class="lineno">  583</span>            }</div>
<div class="line"><span class="lineno">  584</span