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Message: <blockquote data-quote="Core" data-source="post: 6688079" data-attributes="member: 263471">What are the library fileslibrary files usually defines as .DLL and it's a way to make a part of programming codes to future using ,after that all you have to do is just refer the library file and insert the input and eventually you can get the output from library file like make a cake you insert the cake to oven and finally you get out a baked cake so in here the oven acts as a library fileAdvantages of using Library filesYou don't  need to type codes so much ,once you made a library file for special part ,like (basic arithmetic calculation )then you may need to insert the first_value and second_value to the library file and finally you can get the answer from the library file so it's the answer of above two valuesalso you can use it in different languages ,assume you made a .DLL file in VB.nET then you can also use it under any Microsoft (but same CLR version (.NET version))  languages which come along with Visual Studio package Way to make Library FilesIn this example I am going to perform some basic arithmetic operation First make a new projectSelect Class Library as your project typeNow you can see there is almost nothing just spaces with few linesNow add the following codes'///////////The .DLL (Class Library File)'********************************************Public Class Arithmetic_Operation'//all codes were written by Core(myself) and belong to Core so don't steal this shit'//reposting , copy paste doesn't matter but need to put the reference first Dim _firstValue ,_secondValue ,_answer as DoubleDim _symbol as StringPublic Function calculate(ByVal firstValue , ByVal secondValue ,ByVal symbol ) as DoubleSelect case symbol case "+"answer  = Val(firstValue)  + Val(secondValue)case "-"answer  = Val(firstValue)  - Val(secondValue)case "/"answer  = Val(firstValue)  / Val(secondValue)case "*"answer  = Val(firstValue)  * Val(secondValue)case ""MsgBox("error Message")End SelectReturn answer End Function End Class'********************************************the main form------------------------Import DLLNAME.Arithmetic_OperationPublic Class MainFormDim _firstValue ,_secondValue DoubleDim _symbol as StringDim _dll_file as new DLLNAME'//add buttonPublic Sub btn_add(ByVal sender as Object,ByVal e as System.EventArgs)Handler btn_add.Click_firstValue = TextBox.Text '//get the value from textbox(user typed value '//to firstValue variable)_symbol = "+" '//symbol represents what to do (it may useful in equal '//button because we have only one equal button)TextBox.Clear()  '//clear the textbox to type to second value '// 1 + 2 = 3 ('//first you type 1 then + then 3 then finally = )'('//first you type 1 then + then 3 then finally = )'when you type the value 1 then display box (textbox shows it on itself)'then you type one of operator keys (because anyone can type any 'operator it doesn't matter first + ,- ,* ,/ so symbol is needed to determine'which operator key was clicked finally clear the textbox to type to second 'value End Sub'//subtract buttonPublic Sub btn_subtract (ByVal sender as Object,ByVal e as  System.EventArgs)Handler btn_subtract .Click_firstValue = TextBox.Text_symbol = "-"End Sub'//multiply buttonPublic Sub btn_multiply (ByVal sender as Object,ByVal e as  System.EventArgs)Handler btn_multiply.Click_firstValue = TextBox.Text_symbol = "*"End Sub'//divide buttonPublic Sub btn_add(ByVal sender as Object,ByVal e as  System.EventArgs)Handler btn_divide.Click_firstValue = TextBox.Text _symbol = "/"End SubPublic Sub btn_equal(ByVal sender as Object,ByVal e as  System.EventArgs)Handler btn_equal.Click'insert the input values to the  DLLNAME.Arithmetic_Operation's(DLL file) 'calculate method and that method finally return the answer to its name 'so 'all you have to do is just refer its name with insert values ,it will return the 'answer eventually so that value pass over to the display (in here TextBox's .Text Property because only values show on that pass to .Text property)_secondValue = TextBox.Text '//get the second value and pass to second 'Value variableTextBox.Text = Val(_dll_file.calculate(_firstValue,_secondValue,_symbol))'//the Val(as String)as Double method returns any values contains in any string  variableEnd SubEnd Class    NOTEif I have done anything wrong then plz tell me I am bored to test this out anyway don't copy and paste because this format is not suitable and there should be done some modifications but basically coding goes like this wayremember to use ' ' for comments to comment out my texts</blockquote>

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