Example

string strrfind = "My nick name is jk";
int intchar = strrfind.IndexOf("n");
MessageBox.Show(intchar.ToString());

Example

string strrfind = "My nick name is jk";
char[] test ={ 'n'};
int intchar = strrfind.IndexOfAny(test,5);
MessageBox.Show(intchar.ToString());

Example

string strreplace = " My changed nick name is jk";
MessageBox.Show(strreplace.Replace("jk","JEY"));

Example

string strsplit = " Here is a message for the Dot net developers. I am splited into two text now.I am the next text";
//Split shar
char [] csplitchar={'.'};
string [] strsplitcvalues;
//Splited values in a array
strsplitcvalues = strsplit.Split(csplitchar);

//To display the array
foreach(string s in strsplitcvalues )
{
MessageBox.Show ("The spliter string is " + s);
}