Streamwriter to txt file from a text box in services

I am trying to create a WCF service that will enable me to write items (string,int,DateTime) from their respective text boxes into a text file. Also the result will return true when the input is successful and false when it failed. The following code is what i came up with.

- Am i using the streamwriter method correctly ?

- how do i point towards my textbox since this is being done in WCF service and web form is created separately ?

 public bool person(  String fruits, String juice_type,DateTime dateofpurchase, int qty);
    {
if (StreamWriter writer = new StreamWriter("jucie_store.txt", true))
        {
            StreamWriter.WriteLine(TextBox1.Text);
            StreamWriter.WriteLine(TextBox2.Text);
            StreamWriter.WriteLine(TextBox3.Text);
            StreamWriter.WriteLine(TextBox4.Text);
            StreamWriter.WriteLine(TextBox5.Text);
            StreamWriter.WriteLine(TextBox6.Text);return true;
      }else
{
return false;
}
    }