Cast DataRowView As A Typed Row?

-update start

Unable to cast object of type 'namespace.Student' to type 'System.Data.DataRowView'

<%# FixNull(((System.Data.DataRowView)Container.DataItem).Row, "Name")%>

protected string FixNull(DataRow dr, string fieldName)
{
if (dr != null)
{
if (!dr.IsNull(fieldName))
return (dr[fieldName]).ToString();}
return " ";
}

-update end

in the below method expecting an object, so how would i cast it to that type? i always get null no matter what column.

calling from .aspx:

<%# FixNull((mynamespace.Student)(Container.DataItem), "CreatedBy")%>

.CS

protected string FixNull(object dataItem, string fieldName)
{
if (dataItem != null)
{
DataRowView drv = (DataRowView)dataItem;
if (drv != null) //always getting null
{
if (!drv.Row.IsNull(fieldName))
return (drv[fieldName]).ToString();
}
}
return " ";
}