SharePoint: Web Parts not adding in proper order

I was adding few XsltListViewWebPart web parts programatically on a web part page. But the web parts were not getting added in proper order. Following is the code which adds XsltListViewWebPart to page.

public static void AddXsltListViewWebPartToPage(SPLimitedWebPartManager wpm, string listName, 
    string viewName, string zoneId, int zoneIndex, SPWeb web)
{
    SPList l = web.Lists[listName];
    XsltListViewWebPart xsltWp = new XsltListViewWebPart();
    xsltWp.ListName = l.ID.ToString("B").ToUpper();
    xsltWp.ViewGuid = l.Views[viewName].ID.ToString("B").ToUpper();                
    wpm.AddWebPart(xsltWp, zoneId, zoneIndex);
}

Here is how this code was called to add there web parts on a page in the same zone named "ContentZone":

AddXsltListViewWebPartToPage(webPartManager, "Internal Contacts", "All Contacts", "ContentZone", 0, web);
AddXsltListViewWebPartToPage(webPartManager, "External Contacts", "All Contacts", "ContentZone", 1, web);
AddXsltListViewWebPartToPage(webPartManager, "Other Contacts", "All Contacts", "ContentZone", 2, web);

But "Other Contacts" was getting added before "External Contacts". After some hit and trial I changed the zone index to start from 1 rather than zero and it worked. Here is the updated code:

AddXsltListViewWebPartToPage(webPartManager, "Internal Contacts", "All Contacts", "ContentZone", 1, web);
AddXsltListViewWebPartToPage(webPartManager, "External Contacts", "All Contacts", "ContentZone", 2, web);
AddXsltListViewWebPartToPage(webPartManager, "Other Contacts", "All Contacts", "ContentZone", 3, web);

SharePoint: Web Parts not adding in proper order

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