studentTableAdapter studentTable = new studentTableAdapter();

string s = txtName.Text;

string d = txtDate.Text;

if (d == "")

{

d = null;

int i = studentTable.InsertStudent(txtName.Text, Convert.ToDateTime(d));

}

here's my code and i am using typed dataset in my application, without convertto.datetime it gives error that best overloaded function for insertstudent has some invalid argument(string,System.datetime)