Hi: OK, for example: If you are building a string to be passed to a Database for execution you would pass it one string without any line breaks in the string itself or use a parameterized query. If you are just creating lines of code to print out or display in a browser or in a textbox then you would use a string with line breaks so each segment of the string would be displayed on individual lines in the browser or TextBox. When you use the StringBuilder or the plus or and signs to append text to a string you are not creating a multi-line string you are just making the string longer and longer but it is still only one string. For Example: MyString = "abc" + "def" the contents of the MyString variable would be "abcdef". This is called string concatenation.You could use several lines of code to build a string variable contents: Dim MyString As String MyString = "abc" + _ "def" + _ "123" and the MyString would be: "abcdef123". You can add special characters to the string like line breaks like: MyString = "abc" + VbCrlf + "def". Now the value would be: "abc(a line break ascii code)def". ThThat would still be one line of text in storage at the address of the MyString variable but would appear as 2 lines of text when displayed in a TextBox. The LineBreak character would likely throw an error if you include it in the string and then tried to pass it to a Database Engine for execution. It is only for displaying the string in a TextBox or other user display control. You can concatenate strings like above or: Dim MyString As String MyString = "abc" MyString = MyString + "def" My String = MyString + "123" and the result: MyString = "abcdef123". Are you planning your string to just be displayed in a TextBox or for a reader to view or you actually planning on using it as a query string to pass to a Database? That is what will determine if you use the line breaks in the string. There is no such thing as a multi-line string. You can use several lines of code to create a string and you can put line break characters, tabs and other special characters inside a string but the string itself is only one long grouping of characters, letters, numbers and special characters. What are you trying to do once you have the string built? Use it in a TextBox or other display object or pass it to a Database for execution? Rick USA ----- Original Message ----- From: Kerneels Roos To: programmingblind@xxxxxxxxxxxxx Sent: Wednesday, August 11, 2010 5:03 AM Subject: Re: C# Multi-line String Literals Thanks for all the info Rick. I don't mind long emails if they are interesting and convey good info ha ha! Oh yeah, I totally agree with you about actual values which one will do via parameterised queries. What I meant with multi line strings is simply that, for a big query you don't want to put it all on one line -- it becomes very hard to read it like that. Splitting it across lines is a much better approach. Previously I thought that the "+" string concatenation operator was very slow, but now it looks like it's not really a problem if the string is a constant, meaning, the value is totally known at compile time. Some guy inspected the actual byte code and saw that the compiler is smart enough to make one long string if it's just a constant string value, even if you use "+" operators. The "@" operator for denoting very literal string is definately also treated like that by the compiler with the exception that you introduce a glut of white space and new line chars since the compiler can surely not remove those, that would attack the integrity of your code itself or data rather. StringBuilder is for sure by far the best way to go if you are going to append to a string in a loop or something -- append a variable number of times, but my question is just what about if you are appending a fixed number of times, like when you want to display some sql string literal more reader friendly, is the StringBuilder approach still more eficient? It cant' b. Regards On Wed, Aug 11, 2010 at 10:43 AM, RicksPlace <ofbgmail@xxxxxxxxx> wrote: Hi: OK, first a StringBuilder creates one variable to hold the string. No matter how many times you change that string you will have one variable and that will save space and perform faster than using a standard string variable if you change the value of the StringBuilder object more than a few hundred times or so. A standard String variable is created new each time you change the contents of the string so you can get a bunch of variables created if you change the value held in the string. Now, it looks like you are trying to build a Database Query String in a StringBuilder or String Variable. In your example you include the where clause and the value to test for "5" if I remember in the string itself. This is not how you would creat4e a Query String if you are going to have diferent values for a where clause or other clauses that might have values that would change. You can build a query string and use it by passing the string and a value to the DB Engine but the correct method would be to use a Parameterized query. In your example the query might execute ok but what if you wanted to use a text value in the where clause? Then you would have to use single quotes or, depending on the DB Engine settings use Single quotes for the query string and double quotes for the value. You want to use a Parameterized query if you are learning to work with a Sql Server or Sql CE Database, likely an Access DB or other DB if Parameterized querys are supported for non MS Databases as well. So, you can use either StringBuilder or a standard string to build a string. By the way, I am not sure about Multi-Line strings, a string is one long line of text as far as I know. You can include line breaks in a string but the string itself is one long line of text. If you want multi-lines you would use a list object or a table or array object to hold each line of text. A list might look like: List.( Of String). Then you can use the list of strings by using the methods and properties of the List Object like the Append, For Each, Remove and all that jazz. But, it sounds like you just want to build either a standard query string or want to use Parameterized queries for the code you are working on. PS, my list object code is from vb.net but I believe it is a Framework object so should be the same in C# or other VS Languages. Well, sorry this is sort of long but a simple answer is that there is actually no such thing as a multi-line string. You can code several lines to build a string and variious objects that hold strings like an array or list but each string is one long group of characters so I don't understand the question exactly. In the MS Docs the StringBuilder AppendLine just addes a line break in the long string you are building: According to the MS Docs: StringBuilder.AppendLine Method Appends the default line terminator to the end of the current StringBuilder Well, my answer is to use the simple string object unless you will be changing the string variable more than say 50 or 100 times without destroying it by leaving the class or method where it is defined so you don't build thousands of variables, one each time you change the value of the string. Rick USA ----- Original Message ----- From: Kerneels Roos To: programmingblind Sent: Wednesday, August 11, 2010 3:57 AM Subject: C# Multi-line String Literals Hi List, Three ways to do this, which one is best: 1. StringBuilder sb = new StringBuilder(); sb.AppendLine("SELECT id "); sb.AppendLine("FROM my_table "); sb.AppendLine("WHERE id > 5"); 2. string myMultiLine = "SELECT id " + "FROM my_table" + "WHERE id >5"; 3. string myMultiLine = @"SELECT id FROM my_table WHERE id > 5"; Method 1 is the usual way, 2 introduces extra whitespace and lime breaks, and 3 apparently does not result in slower code if the whole string is known at compile time -- the compiler is smart enough to make it into one string (see: http://jameskovacs.com/2007/02/12/multiline-strings-in-c/ ). If you know that you are going to have to tweak the string and have a few round trips to the query analyzer I would say that 2 would actually be best since you only have to remove the first @" and last "; and the literal string will run. Once you know the string is perfect I would say method 3 is the best since it looks like it might be faster than method 1 and does not have the extra, maybe unwanted additional whitespace and new line chars that method 2 introduces. What do you guys think? Regards, -- Kerneels Roos Cell/SMS: +27 (0)82 309 1998 Skype: cornelis.roos The early bird may get the worm, but the second mouse gets the cheese! -- Kerneels Roos Cell/SMS: +27 (0)82 309 1998 Skype: cornelis.roos The early bird may get the worm, but the second mouse gets the cheese!