remove bugs please , and explain in detail what wrong thing i was doing in it

<b>Error    1    System.IO.StreamReader' does not contain a definition for 'close' </b>   ...is that so . update this with the correct code..
//
  if(!Page.IsPostBack)
        {
            StreamReader strmEditFile;
            try{
                //Open the file
                strmEditFile = File.OpenText(strPath + "\\" + strFile);
                //Read its text
                txtEditFile.Text = strmEditFile.ReadToEnd().ToString();
                //Close the file.
                strmEditFile.close();
            }
            catch(FileNotFoundException ex)
            {
                // If it does not exists . create it.
                File.CreateText(strPath + "\\" + strFile).Close();
                //Clear the text Box
                txtEditFile.Text = "";
            }
            catch(System.UnauthorizedAccessException ex)
            {
                Server.Transfer("NotAuthorized.aspx");
            }
<b><u>
and u 9 what catch  block is also showing error that ex(object) is declared but not used here ,,,,
Please guide as earliest as possible</u></b>
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