Convert text to TitleCase

System.Globalization.CultureInfo ci = new System.Globalization.CultureInfo("en-US");
<big>System.Globalization.TextInfo myTextInfo = ci.TextInfo;</big>
string sampleStr = "this IS a sample text"; 
string titleStr = myTextInfo.ToTitleCase(sampleStr);
Console.WriteLine(titleStr);
Console.ReadLine();