Inserting brakes in a long text

This code show how to insert brakes in long text..

 public string insertBreak(string strMessage, int cdeIndex)
    {
        String jobname = strMessage;
        if (jobname.Length > cdeIndex)
        {   
            int k = cdeIndex;
            int j = (jobname.Length / k);
            
           
            for (int i = 0; i < j; i++)
            {
                int cdeDifference = 0;
                int cdeFindspace = 0;
                if ((k + 10) < jobname.Length)
                {
                    cdeFindspace = jobname.IndexOf(" ", k - 2, 10);
                }
                else { cdeFindspace = -1; }
                if (cdeFindspace != -1)
                {
                    cdeDifference = cdeFindspace - k;
                    k = cdeFindspace;

                }
                jobname = jobname.Insert(k, "<br />");
                if ((k + (k + 6)) < jobname.Length)
                {
                    k = k + (k + 6) + (cdeDifference);
                }
                else
                {
                    break;
                }
            }
        }
        return jobname; 
    }