Using Javascript in Asp.net

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C#

ASP.NET

Javascript

C#4.0

When I first click on the LinkButton it opens the window and I minimized it and again click on that link now that window remains minimized it just refreshes the content of it. I want that it must pop up the window after second click which I have minimized.

void lnkViewOrderDocuments_Click(object sender, EventArgs e)
{
     StringBuilder sb = new StringBuilder();
     if (null != Request.QueryString[CONST_OrderNo])
     {
         string dmuUrl = OrderHelper.SetDMULinkURLFromConfig(Request.QueryString[CONST_OrderNo].ToString(),
        Request.QueryString[CONST_OrderType].ToString());
        sb.Append(@"<script language="'javascript'" type='text/javascript'>;");   
        sb.Append(dmuUrl.Trim());
        sb.Append(@"</script>;");
        this.RegisterStartupScript("RegisterSalesTextScript", sb.ToString());
     }
}
sDocumentMergingUtilityURL = string.Format("javascript:window.open('" + sDocumentMergingUtilityURL + "','Window1');return false;");