//Creates char-array out of the string
string str = "Hello";
char[] characters = str.ToCharArray();
//if string is only one letter:
string str = "A";
char character = char.Parse(str);
//or
string str = "A";
char character = str.ToCharArray()[0];
string sentence = "Mahesh Chand";
char[] charArr = sentence.ToCharArray();
foreach (char ch in charArr)
{
Console.WriteLine(ch);
}