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     Visual Basic to C# tricks, #Develop (SharpDevelop)
    It is surprising how close together VB.NET and C#.NET are as programming languages. Each uses the Microsoft .NET Framework. The classes are addressed identically with intellisense working on both.  The most obvious differences are the way code blocks are broken, as C# is a curly brace language.

    In an earlier Forum Post, SharpDevelop (#develop) - .NET GUI IDE FREE!, there are notes about a free tool called SharpDevelop.

    SharpDevelop (#Develop) is a free IDE for C#, VB.NET and Boo projects on Microsoft's .NET platform.

    Why SharpDevelop, when Visual Studio Express is free? Check out the Visual Studio Express and SharpDevelop Compared table to see the differences.

    Probably the biggest plus is that SharpDevelop has a built-in C# to VB to C# code conversion tool. There is also source code for said tool that programmers have adopted for their own use. One example is the Developer Fusion C# to VB conversion web site

    There are also reports on the web that you can place this application on a USB flash drive and run it from any computer that has .NET installed.

    I have used the Developer Fusion conversion site extensively to convert code between C# and VB back and forth. I had a co-worker get into a religious discussion about how C# is superior to VB. I took one of his C# apps and ran it through the conversion tool. Within an hour it was working and ran through the test scripts. Converting from VB to C# is actually a little more difficult, because C# is more rigid in terms of case sensitivity, and the use of string functions. Also C# differentiates between parentheses in functions and brackets in arrays. VB always uses parentheses.

    Original Basic string functions
      I find that knowing the equivalent to the original Microsoft Basic string functions has been the biggest barrier for me to mastering C# and Java. Surprisingly, there are not really equivalents of these in PERL, which is a language I have much experience. The only VB constant I ever have used is the vbCrLf that first appeared in the original Visual Basic. It was a shortened version of Chr(13) + Chr(10).   ASC ( S ) returns B Returns the ASCII value of the first character in S.   B=Convert.ToInt16(S);   CHR$ ( B ) returns S Returns a string consisting of a single character whose ASCII value is B.   S=Convert.ToChar(B).ToString();   S = vbCrLf is the same as S = Convert.ToChar(13) + Convert.ToChar(10);   LEFT$ ( S1 , I ) returns S2 RIGHT$ ( S1 , I ) returns S2 Returns a string containing, respectively, the leftmost or rightmost I characters in S1. S2 = S1.Substring(0, I); S2 = S1.Substring(S1.Length - I, I);     MID$ ( S1 , I1 , I2 ) returns S2 Returns substring of S1 that starts at index I1 and has length I2.   S2 = S1.Substring(Start (0 not 1),Length)     LEN ( S ) returns I Returns the length of S.   I = S.Length;     STR$ ( N ) returns S Returns the string representation of N, e.g. STR$(3.14) = "3.14".   S = N.ToString();   VAL ( S ) returns N Returns the value of S considered as a number, e.g. VAL("3.14") = 3.14. If S does not contain a valid number, then VAL returns 0.   N = Convert.ToIn32(S)   (Also Convert.ToDouble(S) ) .   STRING$ ( I , S1 ) returns S2   Returns a string of length I, all of whose characters are the first character of S1.   No “direct” equivalent of this statement used for formatting headers or dividing lines with repeating characters. S2 = new System.Text.StringBuilder().Insert(0,"myString",count).ToString()     Date Functions Some functions become inherently more complex in C#. Format(Now,”MMddyyyy”) becomes String.Format(“{0:MMddyyyy}”,DateTime.Now)   GetMonthName and similar shortcuts do not exist in C#   public static string GetMonthName(int month, bool abbreviate, IFormatProvider provider)         {             DateTimeFormatInfo info = DateTimeFormatInfo.GetInstance(provider);             if (abbreviate) return info.GetAbbreviatedMonthName(month);             return info.GetMonthName(month);         } Case for VB.NET If I were to make a case for Visual Basic .NET as a desirable programming language, I would concentrate on these bullet points.  
    • Case Insensitivity and case correction on variables: When you use a variable name in a code block, the case automatically corrects to match the case of the variable declaration. That is if you have declared MyCalculationString, and type “mycalculationsTRING”, the newly typed variable will correct to “MyCalculationString”.
    • Looser requirements on methods and syntax: tostring and tostring() both work
      Case for C#.NET If I were to make a case for C# as a desirable programming language, I would concentrate on these bullet points.
    • Bracket code blocks in curly braces and semi-colons make an easy transition from C, C++ and Java.
    • Arrays use the square brackets to denote the element set instead of parentheses

    Some differences between c# and
    Feature Visual Basic .NET Visual C# .NET Case sensitive Not case sensitive: response.write("Yo") ' OK Case sensitive: response.write("Yo"); // Error Response.Write("Yo"); // OK Functional blocks Use beginning and ending statements to declare functional blocks of code: Sub Show(strX as String)   Response.Write(strX) End Sub Use braces to declare functional blocks of code: void Show (string strX) { Response.Write(strX); } Type conversion Implicit type conversions are permitted by default: Dim intX As Integer intX = 3.14  ' Permitted You can limit conversions by including an Option Strict On statement at the beginning of modules. Type conversions are performed explicitly by casts: int intX; intX = 3.14; // Error! intX = (int)3.14; //Cast, OK. Or, use type conversion methods: string strX; strX = intX.ToString(); Arrays Array elements are specified using parentheses: arrFruit(1) = "Apple" Array elements are specified using square brackets: arrFruit[1] = "Apple"; Methods You can omit parentheses after method names if arguments are omitted: strX = objX.ToString You must include parentheses after all methods: strX = objX.ToString(); Statement termination Statements are terminated by carriage return: Response.Write("Hello") Statements are terminated by the semicolon (;): Response.Write("Hello"); Statement continuation Statements are continued using the underscore (_): intX = System.Math.Pi * _   intRadius Statements continue until the semicolon (;) and can span multiple lines if needed: intX = System.Math.PI *    intRadius; String operator Use the ampersand (&) or plus sign (+) to join strings: strFruit = "Apples" & _   " Oranges" Use the plus sign (+) to join strings: strFruit = "Apples" +    " Oranges"; Comparison operators Use =, >, <, >=, <=, <> to compare values: If intX >= 5 Then Use ==, >, <, >=, <=, != to compare values: if (intX >= 5) Negation Use the Not keyword to express logical negation: If Not IsPostBack Then Use the ! operator to express logical negation: if (!IsPostBack) Object comparison Use the Is keyword to compare object variables: If objX Is objY Then Use == to compare object variables: if (objX == objY) Object existence Use the Nothing keyword or the IsNothing function to check if an object exists: If IsNothing(objX) Then Use the null keyword to check if an object exists: if (objX == null)  
    Posted on Thursday, September 25, 2008 @ 07:55:30 UTC by BB
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