Question

I have a problem and I would like your help. I have in my page an edit button and textboxes. I want to edit one single record from the database to these textboxes. I wrote the following code, when I click the edit button then I have the results. The results load in my textboxes. But when I try again to run the page with the same ID for second time then I have this error ‘Specified cast is not valid.’ What’s going wrong? I used int ID=3; to get the 3rd record in this example

protected void Button2_Click(object sender, EventArgs e)

{

DataClassesDataContext cxt = new DataClassesDataContext();
USER_TABLE aChar = cxt.USER_TABLEs.Single(c => c.ID == 3); //gets a single record

            fname2.Text = aChar.FIRST_NAME;
            lname2.Text = aChar.LAST_NAME;
            pob2.Text = aChar.PLACE_OF_BIRTH;
            pom2.Text = aChar.PLACE_OF_MARRIAGE;
            education2.Text = aChar.EDUCATION;
            occupation2.Text = aChar.OCCUPATION;
            pod2.Text = aChar.PLACE_OF_DEATH;
            String str = aChar.DATE_OF_BIRTH.ToString();
           String str1 = aChar.DATE_OF_MARRIAGE.ToString();
            String str2 = aChar.DATE_OF_DEATH.ToString();

Answer 1

Why are you doing if (!Page.IsPostBack) in your event handler code?

I’d say that normally an event is only raised upon post-back…

I rarely see IsPostBack used in anything other than PageLoad.