Property Attributes

Hello Experts,

I am working with a VB .net project, and am looking at some of the defined properties. There are several items above the property that are labeled "AttributeColumnName" AttributeDBColumnName. I have never seen that before in VB.net. Can someone familiar with VB.net explain it to me? Why are these attributes above the property name? Can someone point me to some online documentation on this?

<AttributeColumnName("CITY_STATE"), AtributeDBColumnName("CITY_STATE"), AttributeDataType("char"),AttributeKeywordField("pCITY_STATE"),AttributeFieldLen(8),AttributeColumnIndex(12)>
Public Property CITY_STATE() AS String
 Get
    Return m_strCITY_STATE
 End Get
Set(ByVal strVal AS String)
   m_strCITY_STATE = strVal
End Set
End Property