c# - Richtext Box-TextChanged Even and checking spaces in current line -

is possible check no. of spaces in current line of richtextbox text changes event... example

lin1: word1 word2 word3 lin2: word1 word2 word3 word4  when type space after word3 shows me message cannot enter word4 

first off, use textbox extension , apply richtextbox(see code below, complete version findable here)

public class textboxextension : textbox {  public textboxextension (){ }   public int currentlineindex  {     { return this.getlinefromcharindex(this.selectionstart) + 1; }  } } 

then following:

int maxwordsallowed = 4;  private void textchangedeventhandler(object sender, textchangedeventargs args) {         //this space character count in current line      if (myrichtextbox.lines[myrichtextbox.currentlineindex].split(' ').length - 1) > maxwordsallowed )       messagebox.show("reached maximum words line");     }