How to connect to a database from VC++/CLI .NET 4.0
- by abatishchev
How to connect to a database (any natively supported by .NET) - SQL Server 2008 or Access - from a Windows Forms application written on VC++/CLI (compiler ver. 16.0 from .NET 4.0)
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Why "\d+{1,4}(?:[.,]\d{1,4})?" in RegularExpressionValidator throws Exception: "Nested quantifier {"
- by abatishchev
I have asp:RegularExpressionValidator with ValidationExpression="\d+{1,4}(?:[.,]\d{1,4})?" but it doesn't' work, parser throws ArgumentException: parsing "\d+{1,4}(?:[.,]\d{1,4})?" - Nested quantifier {. Where is my mistake? I want to allow strings like xxxx,xxxx - from 1 to 4 digits and decimal digits are not required, e.g.: 1000, 99,99, 0,2498, etc.Read the article
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Is read-only auto-imlemented property possible?
- by abatishchev
Hello. I found a topic on MSDN that talks that yes, this is possible. I did a test that seems to break this statement: using System; namespace Test { class Program { static void Main(string[] args) { Foo f = new Foo("1"); Console.WriteLine(f.Bar); // prints 1 f.Test("2"); Console.WriteLine(f.Bar);// successfully prints 2 } } class Foo { public Foo(string b) { this.Bar = b; } public string Bar { get; private set; } public void Test(string b) { // this would be impossible for readonly field! // next error would be occur: CS0191 or CS0191 // A readonly field cannot be assigned to (except in a constructor or a variable initializer) this.Bar = b; } } } Where am I wrong?Read the article
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NullDisplayText in markup vs ISNULL(field, 0) in SQL?
- by abatishchev
Which approach is better to use: BoundField.NullDisplayText isn't set. NULL-case is foreseen in SQL query, i.e. SELECT ISNULL(amount, 0) FROM table or BoundField.NullDisplayText is set, e.g. "0.00 %". NULL-case isn't foreseen in SQL query, i.e. SELECT amount FROM table What do you think?Read the article
