C# nokta virgül problemi

C# ". , " nokta virgül ayarlarını program için özel olarak ayarlamak için formun load olayı içerisinde

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using System.Globalization;

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Thread.CurrentThread.CurrentCulture =  new CultureInfo("tr-TR");

Thread.CurrentThread.CurrentUICulture = new CultureInfo("tr-TR");

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Veya 

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Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US");

Thread.CurrentThread.CurrentUICulture = new CultureInfo("en-US");
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Yazmanız yeterli.

Ayrıca sadece belirli bir ayarı set etmek istiyorsanız aşağıdaki gibi kullanabilirsiniz.

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Thread.CurrentThread.CurrentCulture = new CultureInfo("tr-TR");
Thread.CurrentThread.CurrentUICulture = new CultureInfo("tr-TR");
    
System.Threading.Thread.CurrentThread.CurrentCulture.NumberFormat.NumberDecimalSeparator= ".";

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