Checking Textbox's all rows

Question

Hello I want to check a textbox's all rows. For example a user will write some IP's to textbox and then I will check all of these IP's that if they recorded to db. Textbox is; -------------------- 12.12.12.1 1.1.1.1 4.5.5.5 4.56.56.56 ... -------------------- Then I have a db that recorded Ip addresses. I want to control that which one of them is recorded before and which one of them isn't recorded. How can I check every row's IP's?

Vulpes · Answer

If the user is pressing the return key after entering each IP I'd try something like: string[] ipAddresses = TextBox1.Text.Split(new string[] { Environment.NewLine} StringSplitOptions.None); string thirdAddress = ipAddresses[2];

Sam Hobbs · Answer

Yeah sorry; I often don't think in terms of ASP.

Vulpes · Answer

Unfortunately it's ASP.NET and so the TextBox doesn't have a Lines property.

Sam Hobbs · Answer

I would probably use the Lines property of the TextBox to get an array of lines.

Vulpes · Answer

Well the TextBox's Rows property tells you how many rows are displayed but that doesn't mean that there's anything in all of them. If you're using the previous code then ipAddresses.Length will tell you how many rows have something in them. However you might want to change StringSplitOptions.None to StringSplitOptions.RemoveEmptyEntries in case the user enters any blank lines.

yokzu · Answer

One more question; I'll use a while loop for checking all value. How can I know that how many rows are in the textbox?

yokzu · Answer

Thanks Vulpes. It works :)

yokzu · Answer

For example how can I get 3.rd row's value?