父窗口弹出子窗口的 button处理事件:
private void Button1_Click(object sender, System.EventArgs e)
  {
   Response.Write("<script language=javascript>window.open('WebForm1.aspx','', 'alwaysRaised=1,dependent=1,resizable=0,scrollbars,width=450,height=550');</script>");
  }
父窗口html代码添加如下javascript代码
<script language="javascript">
function refresh()
{
this.location = this.location;
}
</script>
子窗口关闭窗口的 button处理事件:
private void Button1_Click(object sender, System.EventArgs e)
{
StringBuilder scriptString = new StringBuilder();
scriptString.Append("<script language = javascript>");
scriptString.Append("window.opener.refresh();");

scriptString.Append( " window.focus();" );
scriptString.Append( " window.opener=null;" );
scriptString.Append( " window.close(); " );

scriptString.Append("</"+"script>");
Response.Write(scriptString.ToString());

// Response.Write("<script language=javascript>window.close()</script>");
}