C Sharp :: Display MySQL Database Table User Info?

I was looking at this code:

private void button1_Click(object sender, EventArgs e)
{
string input = textBox3.Text;

[Code].....

And how to rewrite the code so that it display the MySQL table data for a specific user I already have a string called username and that stores the username entered on the login form. I want the code to use the username string to search for the name and display that users info.

My table contents are: username
First name
Last name
Position
Employee Id
Airline