I have a component COM in VFP 7 that return one string XML. How I make to present this in a DataGrid?

I try:

lcXmlRet = (string) oVFP.SearchEmpresa("tes");
DataSet loDS = new DataSet();

loDS.ReadXml(lcXmlRet); ==> Error: Invalid URI: The URI scheme is not valid.

this.DataGrid1.DataSource = loDS.Tables[0];
this.DataGrid1.DataBind();