Asp.net How to pass Value From Child Page to Parent Page

-For Parent Page Open Child Window

protected void Page_Load(object sender, EventArgs e)
{
string openWindow = @”window.open(‘Child.aspx’)”;
this.Button1.Attributes.Add(“onclick”, openWindow);
}

For Child Page

this.LinkButton1.Attributes.Add(“onclick”, “PassValues()”);

Write this Code for Javascript in Child Page

This code will pass value in Window.opener Form With Given Text Box

<script language=javascript>
function PassValues()
{
var txtValue = document.getElementById(“<%=TextBox1.ClientID%>”).value
window.opener.form1.txtUserName.value = txtValue;
window.close();
}
</script>

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