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Hi,
Try like this, use unadorned:yes;
ScriptManager.RegisterStartupScript(this, typeof(Page), UniqueID, "javascript:var ans = window.showModalDialog('TransactionHistoryDetail.aspx?' + '&rowID=" + rowID + "&Type=" + OrderType + "&OrderNo=" + OrderNo + "', 'unadorned:yes;dialogWidth=1000px;dialogHeight=700px;resizable: yes;dialogLeft=' + ((screen.width - 1000) / 2) + ';dialogTop=' + (screen.height - 700) / 2 + ''); ", true);
Regards,
Iftikar