DateTime strange error

DateTime? billDateFrom = string.IsNullOrWhiteSpace开发者_Go百科(txtBillDateFrom.Text) ? null : (DateTime?)DateTime.Parse(txtBillDateFrom.Text);

txtBillDateFrom.Text equals "05/26/2011". (26 may 2011)

This code throws an error "String was not recognized as a valid DateTime" only in a web application. In a console application it works good. Why? Does it depend on locale?

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Yes, the behavior of Parse() depends on the current thread's culture. You can use ParseExact() to make that behavior consistent, regardless of that culture:

DateTime.ParseExact(txtBillDateFrom.Text, "d", CultureInfo.InvariantCulture)

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Yes it does. You can change thread's culture, or get a CultureInfo for a desired locale and pass its DateTimeFormat to DateTime.Parse

// Setting in thread
Thread.CurrentThread.CurrentCulture = System.Globalization.CultureInfo.GetCultureInfo("en-US");
DateTime dt1 = DateTime.Parse("05/26/2011");
// Only for 1 parse
DateTime dt2 = DateTime.Parse("05/26/2011", System.Globalization.CultureInfo.GetCultureInfo("en-US").DateTimeFormat);

Also I beleive you can set the culture in asp.net application's settings.

<system.web>
    <globalization culture="en-US"/>
</system.web>

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Yes, it depends on locale.

You can specify the locale that you want to use in the web.config file, or you can specify it in the call to Parse:`

DateTime.Parse(txtBillDateFrom.Text, CultureInfo.GetCultureInfo("en-GB"))

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It depends on current culture. In web.config you can set needed culture:

<globalization uiCulture="it" culture="it-IT" />

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Try Below

 DateTime dt;
        DateTime.TryParse("05/26/2011", out dt);