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Performs an exact match lookup based on the current index scanning forward through the table.
public virtual bool FindFirst(ul_column_num ncols)
For composite indexes, the number of columns to use in the find.
If no row matches the index value, the cursor position is AfterLast() and the function returns false.
To specify the value to search for, set the column value for each column in the index. The cursor is positioned on the first
row that exactly matches the index value.