stream reader second line visual studio c#

I'm using this method to save my connection sentence into a text file:

MemoryStream ms = new MemoryStream();

byte[] memData = Encoding.UTF8.GetBytes("Data Source=" + textBox1.Text + ";" + Environment.NewLine + "Initial Catalog=" + textBox2.Text + ";" + Environment.NewLine + "User ID=" + textBox3.Text + ";" + Environment.NewLine + "password=" + textBox4.Text + ";");

ms.Write(memData, 0, memData.Length);
FileStream strm = new FileStream(@"C:\Users\Çağatay\Desktop\test.txt", FileMode.Create, FileAccess.Write);
ms.WriteTo(strm);
ms.Close();
strm.Close();
MessageBox.Show("Connection Saved");

Is there a method for reloading lines to textboxes back with streamreader?

I searched and found this:

int counter = 0;
string line;

// Read the file and display it line by line.
System.IO.StreamReader file = new System.IO.StreamReader(@"C:\Users\Çağatay\Desktop\test.txt");
while ((line = file.ReadLine()) != null)
{
    MessageBox.Show(line);
    counter++;
}

file.Close();

But I need something like:

textbox1.text=streamreader.readline[0]
textbox2.text=streamreader.readline[1]

Can anyone help?