Set textbox.text with value from my database c#

Trying to fill texbox.text with data from database.

code:

 con.Open();
           
            SqlCommand updatetextbox = new SqlCommand("SELECT * FROM Arbeidstaker Where Person_id = 1", con);
           
            SqlDataReader myDataReader;

            myDataReader = con.ExecuteReader();

            while (myDataReader.Read())
            {
                TextBox1.Text = myDataReader["Fornavn"].ToString();
            }

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Is there a better way?
My code offc dont work properly...
tnx