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if(this.signature != "")
{
    MessageBox.Show("This is my signature: " + Environment.NewLine + signature);
}
else
{
    MessageBox.Show("404-Signature not found");
}

V.

(MQOTD rules and previous solutions)

if(this.signature != "")
{
    MessageBox.Show("This is my signature: " + Environment.NewLine + signature);
}
else
{
    MessageBox.Show("404-Signature not found");
}

“That which can be asserted without evidence, can be dismissed without evidence.”

― Christopher Hitchens

You have just been Sharapova'd.

Visit my blog at Sander's bits - Writing the code you need.
Or read my articles at my CodeProject profile.

Simplicity is prerequisite for reliability.
— Edsger W. Dijkstra

Regards,
Sander

if(this.signature != "")
{
    MessageBox.Show("This is my signature: " + Environment.NewLine + signature);
}
else
{
    MessageBox.Show("404-Signature not found");
}

What do you get when you cross a joke with a rhetorical question?

The metaphorical solid rear-end expulsions have impacted the metaphorical motorized bladed rotating air movement mechanism.

Do questions with multiple question marks annoy you???

Press F1 for help or google it.
Greetings from Germany