VS 2008 - How To Insert Date In Oracle Database

I want to pick the date from the table(Oracle) & want to insert it into the another table. In Pic see,I am picking the date of the second row. I convert the date to the dd/MM/yyyy format

Code:

TxtHiddenCtrl .Text = DateTime.Parse(ds.Tables[0].Rows[0]["FROM_DATE"].ToString()).ToString("dd/MM/yyyy");

Code:

?TxtHiddenCtrl.Text
"05/10/2001"
If I dont convert the date then

Code:

TxtHiddenCtrl.Text =ds.Tables[0].Rows[0]["FROM_DATE"].ToString()
"10/5/2001 12:00:00 AM"

I convert the date!

Now when i save the date into another table

Code:

cmd.Parameters.Add("@p_FROM_DATE", TxtHiddenCtrl .Text );

Error is dere not a valid Month!Why the error is coming?Its a valid month?