how to send an Email via Default Email Client Using C#

private void button2_Click(object sender, EventArgs e)
{
mailadr = textBox3.Text;
String MM;
MM = “Mailto:” + mailadr + “?subject= headlinetext& body=bodytext”;
System.Diagnostics.Process proc = new System.Diagnostics.Process();
proc.StartInfo.FileName = MM;
proc.Start();
}