Problems with struct properties...

Hello everyone. I am using structs for the first time, and I am getting an error when I compile. The error is in this code here:

Code:

---

foreach (ThumbStruct x in this.ThumbArray)
{
    x.Thumb.Dispose();
    x.Index = 0;  //Underlines the 'Index' part as being wrong.
    x.Path = "";  //Underlines the 'Path part as being wrong.
}

---

The two errors are the exact same, and they read: "The left-hand side of the assignment must be a variable, property, or indexer" The code it underlines is the x.Index assignment and the x.Path assignment (commented in the code above). The funny thing is, elsewhere in my code I use the same code to assign the variables in the struct using the properties. Anyone know why it is throwing this error?

Here is the struct code:

Code:

---

public struct ThumbStruct
{
    private string sPath;
    private int iIndex;
    private System.Windows.Forms.PictureBox pbBox;

    public string Path
    {
          get
          {
        return sPath;
          }
          set
          {
        sPath = value;
          }
    }
    public int Index
    {
        get
        {
          return iIndex;
        }
        set
        {
          iIndex = value;
        }
    }
    public PictureBox Thumb
    {
        get
        {
            return pbBox;
        }
        set
        {
          pbBox = value;
        }
    }
}

---