the name does not exist in current context (windows form)
<p>I am new to c# and I know the answer is very simple I just could not find it through searching</p>

<p>I created two buttons the first one generates random values
and the second one is an IF statement inside another button, but I`m getting a red line under 1value1 saying </p>

<blockquote>
  <p>the name does not exists in current context</p>
</blockquote>

<pre><code>private void button3_Click(object sender, EventArgs e)
{
    Random b = new Random();
    float value = b.Next(50, 100);
}
private void button2_Click(object sender, EventArgs e)
{
    if (value &lt; MinValue)
    {
       textBox18.Text = ("warning");
       textBox18.ForeColor = Color.White;
       textBox18.BackColor = Color.Red;
    }
 }
</code></pre>