openFileDialog1.Filter="txt(*.txt)|*.txt|allfill(*.*)|*.*";
openFileDialog1.FilterIndex=1;
openFileDialog1.RestoreDirectory=true;
if(openFileDialog1.ShowDialog()==DialogResult.OK)
{
this.crystalReportViewer1.ReportSource=openFileDialog1.FileName;
}

SaveFileDialog sd=new SaveFileDialog();
sd.Filter="txt(*.txt)|*.txt|allfill(*.*)|*.*";
sd.RestoreDirectory=true;
if(sd.ShowDialog()==DialogResult.OK)
{
string flname=sd.FileName;
StreamWriter sw=new StreamWriter(flname);
sw.Write(this.textBox1.Text);
sw.Flush();
sw.Close();
}