I am using the following code in Page_Load

Dim metaTagDesc As New HtmlMeta() 'Create a new instance of META tag object
            Dim metaTagKeywords As New HtmlMeta()
            Dim metaTagKeywords1 As New HtmlMeta()
            Dim metaTagKeywords2 As New HtmlMeta()

            metaTagDesc.Attributes.Add("property", "og:title") ' Add attributes to the META tag object for identification
            metaTagDesc.Attributes.Add("content", _table.Rows(0).Item(2))



            metaTagKeywords.Attributes.Add("property", "og:type")
            metaTagKeywords.Attributes.Add("content", "website")

            metaTagKeywords1.Attributes.Add("property", "og:url")
            metaTagKeywords1.Attributes.Add("content", "http://citizen.tricedeals.com/Reports/" & _table.Rows(0).Item(0))

            metaTagKeywords2.Attributes.Add("property", "og:image")
            metaTagKeywords2.Attributes.Add("content", "http://citizen.tricedeals.com/ProfilePictures/" & _table.Rows(0).Item(1) & ".jpg")


            Page.Header.Controls.Add(metaTagDesc)
            Page.Header.Controls.Add(metaTagKeywords)
            Page.Header.Controls.Add(metaTagKeywords1)
            Page.Header.Controls.Add(metaTagKeywords2)

But i keep getting this error..."Your og:type object name has disallowed characters in it. It must match [a-z][a-z0-9._]*"

Why?