remove all non alphabetic characters from string csharp

                
                        var cleanString = new string(dirtyString.Where(Char.IsLetter).ToArray());
                    
                

csharp filter non alphanumeric characters

                        
                                Regex rgx = new Regex("[^a-zA-Z0-9 -]");
str = rgx.Replace(str, "");
                            
                        

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