Problem with column expression

i want to use the column expresion but in this part i cant convert this in my new column that i add with activitiy “Add data Column” this is the error

in the assing
vDtSalarios.Columns(“Fecha_de_nacimiento”).Expression = “Convert([Fecha de nacimiento], ‘System.DateTime’ )”


It seems circular reference. We need to refer other column in expression of the column.
In addition, single quote surrounded DateTime are not necessary.

Can you modify the expression as the following?

vDtSalarios.Columns(“Fecha_de_nacimiento”).Expression="Convert([OtherColumn], System.DateTime)"

or if you just want to add DateTime type column, can you set DateTime at TypeArgument property of AddDataColumn activity?