title: is it true function & call it
body: <pre><code>private void calcu(double a,int x)
  {
      a=Convert.ToDouble(textBox1.Text);
      textBox1.Clear();
  } 
  
  
  private void button26_Click(object sender, EventArgs e)
  {
      calcu(a,1);
  }
  </code></pre>