But the code that event is fired comes after the code that column is accessed. So, I couldn't handle this condition. I'm trying to catch property access, check column if exist. If column does not exist then column will be added to the table.

Is there alternative way to accomplish tis type of requirement ? 

object loValue;

CompaniesFieldAccessingEventArgs e;

System.String loReturn;

loValue = this.CurrentRow["name"];

if (loValue == DBNull.Value)

{

loReturn = String.Empty;

}

else

loReturn = (System.String)loValue;

}

e = new CompaniesFieldAccessingEventArgs(CompaniesFieldNames.name, loReturn);

this.OnFieldPropertyAccessing(this, e);

return (System.String)e.ValueToReturn;

http://forum.strataframe.net/Topic15238-6-1.aspx

if you give a new position for FieldAccessing Event. This may solve the situation.

But I need quick way to progress. Where is the place to call the method. (EnsureColumnExist) There must be a central point.