SparqlParameterizedStringSetBlankNode Method (String, String)

public void SetBlankNode(
	string name,
	string value
)

Public Sub SetBlankNode ( 
	name As String,
	value As String
)

Only guarantees that the Blank Node ID will not clash with any other Blank Nodes added by other calls to this method or it's overload which generates anonymous Blank Nodes. If the base query text into which you are inserting parameters contains Blank Nodes then the IDs generated here may clash with those IDs.