C# application will not display last Attribute Value in XML Document

A C# project I am working on will not display/insert the last value within an XML tag. For Example my application iterates through this tag and will get 1, 2 3 but not 4. It does that with every iteration.

<purpose>
 <intendedUse id="1"/>
 <intendedUse id="2"/>
 <intendedUse id="3"/>
 <intendedUse id="4"/>
</purpose>

I believe it has something to do with the int num declaration.

 for (i = 0; i < xmlnode.Count - 1; i++ )
            {
                str = xmlnode[i].Attributes[0].Value;
                int num = Int32.Parse(str) - 1;
                for ( var count = 0; count < xmlnode[num].FirstChild.NextSibling.ChildNodes.Count - 1; count++)
                {
                    str2 = xmlnode[num].FirstChild.NextSibling.ChildNodes[count].Attributes[0].Value; 
                    MessageBox.Show(str2);
                }

                //SQLiteCommand cmd = new SQLiteCommand(connection);
                //cmd.CommandText = "INSERT INTO languagePurpose (purposeID, languageID) VALUES ('" + str2 + "', '" + str + "')";
                //SQLiteDataReader dr = cmd.ExecuteReader();
               // MessageBox.Show(str);
            }