سلام لطفا بهم بگید برای دکمه open چطوری باید تو #c کد بزنم؟


اینم کد دکمه save هست:

protected void btnSave_Click(object sender, EventArgs e)
{
txtFileName.Text =
txtFileName.Text.Trim();
if(txtFileName.Text==string.Empty)
{
string strErrorMessage =
"you did Not specify fily for opening!";
displayErrorMessage(strErrorMessage);
}
string strFileName = txtFileName.Text;
string strRootRelativePath = "~/app_data/pageContent";
string strRootRelativePathName =
string.Format("{0}/{1}",strRootRelativePath,strFileName);
string strPathName=Server.MapPath(strRootRelativePathName );

System.IO.StreamWriter ostreamWriter = null;
try
{
ostreamWriter = new System.IO.StreamWriter( strPathName,false,System.Text.Encoding.UTF8);
ostreamWriter.Write(txtEditPage.text);
string strInformationMessage =
string.Format("The file [{0}] Saved successfully..",txtFileName.Text);
}
catch (Exception ex)
{
displayErrorMessage(ex.Message);
}
finally
{
if (ostreamWriter != null)
{
ostreamWriter.Dispose();
ostreamWriter = null;
}


}
}
}