Beware that when you call TouchPanel.GetState twice within the game loop, what touch locations had a Pressed state the first time will have a Moved state the second time. Consider the following lines of code.

TouchCollection touches = TouchPanel.GetState();

foreach (TouchLocation locale in touches)
{
    if (locale.State == TouchLocationState.Released && locale.Id == id1)
        id1 = -1;
    else if (locale.State == TouchLocationState.Pressed && id1 == -1)
        id1 = locale.Id;
    else if (locale.Id == id1)
        pos1 = locale.Position;
}

touches = TouchPanel.GetState();

foreach (TouchLocation locale in touches)
{
    // Can fail if the first time through it was Pressed.
    if (locale.Id == id1 && locale.State == TouchLocationState.Pressed)
    {
        // Do something important
    }
}

Note that it isn’t important that these are in the same file let alone the same method. You cannot rely on having access to the same state data everytime you call GetState within the game’s loop. So it will probably become important to put the touch code in a global location and store the states for the duration of the loop. For instance you can store the TouchCollection data in a static variable at the top of the Game’s Update method.