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string not converting in datetime format

Posted By:      Posted Date: October 01, 2010    Points: 0   Category :ASP.Net

hi to all,

 i'm developing a website. i have a registration form where user can registered with this website.

this have a birthdate field for store user's birthdate.that is a textbox.

here is my code.

protected void submitbtn_Click(object sender, ImageClickEventArgs e)
System.Globalization.CultureInfo en = new System.Globalization.CultureInfo("en-GB");
li.fname = firstname.Text;
li.lname = lastname.Text;
li.gender = gender.SelectedItem.Text;
li.date = Convert.ToDateTime(birthdate.Text,en); //getting error here
li.address = addrs.Text;
li.contactno = contno.Text;
li.countryid =Convert.ToInt32( dropcontry.SelectedValue);
li.stateid = Convert.ToInt32( dropstate.SelectedValue);
li.cityid =Convert.ToInt32( dropcity.SelectedValue);
li.emailid = prmrmailid.Text;
li.username = createuserid.Text;
li.password = createpassword.Text;
li.secutityque = dropsecque.SelectedItem.Text;
li.securityans = secanswer.Text;

int a = li.personid;
li.personid= a;
int p = li.personid;

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