Not Getting Valid Date And Time

I am developing an application using ASP.NET (C#) and SQLServer 2008. In my database i have a field DepositDate and datatype is "DATE". On my data entry form i am taking dates using jquery datepicker and its returning date in textbox as dd/mm/yyyy format as per user requirement whereas i noticed in database its keeping date values as yyyy-mm-dd..i am confused.

While saving record i am getting not a valid date time as the only available conversion format is Convert.ToDateTime and my data requirement is DATE only. Can anyone suggest solution how to deal with it.?

here is the code

DateTime thedate = DateTime.Parse(txt_IDate.Text);
DateTime mdate = DateTime.Parse(txt_Mdate.Text);
db.AddInParameter(cmd, "@SIssueDate", System.Data.DbType.Date);
db.SetParameterValue(cmd, "@SIssueDate", thedate.ToShortDateString());
db.AddInParameter(cmd, "@SMaturityDate", System.Data.DbType.DateTime);
db.SetParameterValue(cmd, "@SMaturityDate", mdate.ToShortDateString());