existence of particular row in datatable in vb.net windows form

Question

Is it possible to check for existence of a particular row in a datatable?
suppose if there are two rows in datatable, is it possible to check whether the third row exists or not?

For j As Integer = 0 To dtemp.Rows.Count - 1
If dtemp.Rows(j)("empcode").ToString.Trim <> dt.Rows(j)("empcode").ToString.Trim Then
'Insert code  
End If  
Next

Answer 1

Are you trying to see if your data is existing or not?

Let's say: If you are inserting data in your database, then you can use the textbox property tag to see whether the data is existing or not.

If Me.txtFirstName.Tag = 0 Then
                sSQL = "INSERT INTO tblAddressBook ( last_name, first_name, mid_name, birth_date, gender, home_adr, bus_adr, tel_no, mobile_no, email)"
                sSQL = sSQL & "  VALUES(@last_name, @first_name, @mid_name, @birth_date, @gender, @home_adr, @bus_adr, @tel_no, @mobile_no, @email)"
                cmd.CommandText = sSQL
            Else
                sSQL = "UPDATE tblAddressBook set last_name = @last_name, first_name =  @first_name, mid_name =  @mid_name, birth_date = @birth_date, gender = @gender"
                sSQL = sSQL & " ,home_adr = @home_adr, bus_adr = @bus_adr, tel_no = @tel_no, mobile_no = @mobile_no, email =  @email where contact_id = @id"
                cmd.CommandText = sSQL
            End If

...or else it will update that data in your database. The code above should give you an idea. SINCE you didn't show your code let's talk on this one.

Answer 2

如果DataRow.Table.Columns.Contains（“ column”）然后MsgBox（“ YAY”）结束