Error converting data type nvarchar to date in ASP.Net

Sir i am getting "Error converting data type nvarchar to date."

i am using sql server 2008 r2 

and my field  datatype is date

 i want to store current date (only) dd-mm-yyyy formate

 Dim pdate As String = DateTime.Parse(DateTime.Now.ToString()).ToShortDateString()
            Dim mfd As String = DateTime.Parse(DateTime.Now.ToString()).ToShortDateString()

and i am inserting it to sql table

please help me