c# - How do I swap two characters in a string variable? -

i have string variable. want swap 2 characters in string word. want randomly swap 2 characters close each other.

this have done: have done in words error.

string word = txtword.text; random rand = new random(); int randomnumber= rand.next(0, word.length); string swappedword = swapcharacters(lastword, randomnumber, randomnumber + 1);  private string swapcharacters(string value, int position1, int position2) {     char[] array = value.tochararray(); // convert string char array     char temp = array[position1]; // temporary copy of character     array[position1] = array[position2]; // assign element     array[position2] = temp; // assign element     return new string(array); // return string } 

just change line below:

int randomnumber= rand.next(0, word.length -1 ); 

let's see if works.