insert datetime into the database

[aish]

I want to insert datetime into the database.I want to insert date as a dd/MMMM/yyyy format

SqlDateTime x;
if((TextBox1.Te xt).Length==0)
{
x=SqlDateTime.N ull;
}
else
{
x=DateTime.Pars e(TextBox1.Text );
}
command=sqlConn ection.CreateCo mmand();
command.Command Text="insert into Table2 values('"+x+"') ";
sqlConnection.O pen();
command.Execute NonQuery();
Response.Write( "Save");

when I add this type of dates ex.25/02/2005 it occur error, how can I solve this.

[aish]

I change my code like this, now it works fine but I have small problem.
if my dropdowns SelectedIndex== 0 then I wants to insert null value. I used for DBNull.Value, but it save as "01/01/1900" but I want to insert "<Null>" How can I do this?

string Mydate;

if(cboDateofBir th_Day.Selected Index!=0 && cboDateofBirth_ Month.SelectedI ndex!=0 && cboDateofBirth_ Year.SelectedIn dex!=0)
{
Mydate=cboDateo fBirth_Day.Sele ctedValue+"/"+cboDateofBirt h_Month.Selecte dValue+"/"+cboDateofBirt h_Year.Selected Value;

}
else
{
Mydate=DBNull.V alue.ToString() ;

}
command=sqlConn ection.CreateCo mmand();
command.Command Text="set dateformat dmy;exec p_Insert_Test '"+Mydate+"' ";
sqlConnection.O pen();
command.Execute NonQuery();
Response.Write( "Save");