Try this, if you want to save username password in the same file
string fileName = textBox1.Text + ".txt";
System.IO.File.WriteAllText(@"C:\\Users\\User\\Documents\\1ClickData\\ID\\" + fileName, "Username="+textBox1.Text+" Password="+textBox2.Text);
or if you want to save username and password in separate file
//for username
string fileName1 = textBox1.Text + ".txt";
System.IO.File.WriteAllText(@"C:\\Users\\User\\Documents\\1ClickData\\ID\\" + fileName1, textBox1.Text);
//for password
string fileName2 = textBox2.Text + ".txt";
System.IO.File.WriteAllText(@"C:\\Users\\User\\Documents\\1ClickData\\ID\\" + fileName2, textBox2.Text);
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solved How to create a .txt file using c#? [closed]