how to set textfield in tableview in iphone?

Question

Hello,

I am new to iphone technology.I am right now preparing an application where the user is shown a table view as a registration form and he need to fill the data in the same form. i have taken custom cell with a label and text field. I am writing in the text box and fetching the same in a string variable that i am using to same data into the database using,

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{
    //NSMutableArray *contactObj;
    static NSString *CellIdentifier = @"Cell";
    CustomCellForEditContact  *cell = (CustomCellForEditContact *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if(cell == nil){
        cell = [[[CustomCellForEditContact alloc]initWithStyle:UITableViewCellStyleDefault  reuseIdentifier:CellIdentifier]autorelease];
    }

    switch (indexPath.row)
    {
        case 0:         
            cell.label.text = @"Firstname       ";
            firstName= [NSString stringWithFormat:@"%@",cell.txtfield.text];
            break;
        case 1:
            cell.label.text = @"Lastname        ";          
            lastName= [NSString stringWithFormat:@"%@",cell.txtfield.text];
                break;
    default:
    break;
    }
  return cell;
}

but my variable is showing me error like out of scope when i am debugging.what should i do as a solution?

Also,when i finish my writing,my keypad is not disabled.i used the method "resignFirstResponder" for the same but in vain. Due to this i am not able to display my datepicker.

Can anybody help me out??

Thanking you.