父窗口如何获得模态窗口的返回值?
private   void   Button2_Click(object   sender,   System.EventArgs   e)
{
  RegisterStartupScript( "key ", " <script> window.returnValue=document.all( 'upFile ').value;window.opener=null;window.close(this); </script> ");    
}


父窗口如何获得返回的值呢?


------解决方案--------------------
父窗口：

function OpenWindow(Url){

}
------解决方案--------------------
var r = window.showModelDialog(...);
alert(r);
------解决方案--------------------
请参考
1.html
<script type= "text/javascript ">
function btnOpen_Click()
{
//document.MainForm.txtValue.value = window.open( "2.html ", null, "height=300,width=300,status=no,toolbar=no,menubar=no,location=no ");
document.MainForm.txtValue.value = window.showModalDialog( "2.html ");
}
</script>
<form name = "MainForm ">
<input type = "button " value= "Click " name = "btnOpen " onClick= "btnOpen_Click(); " />
<input type = "text " name = "txtValue " />
</form>


2.html
<script type= "text/javascript ">
function btnOpen_Click()
{
window.returnValue = document.Form1.txtValue.value;
alert (document.Form1.txtValue.value);
window.close();
}
</script>
<form name = "Form1 ">
<input type = "button " value= "Click " name = "btnOpen " onClick= "btnOpen_Click(); " />
<input type = "text " name = "txtValue " />
</form>