open page in new tab asp.net [duplicate]

Answer 1

Sometimes it works for me to just declare whatever I would invoke dynamically from the administrated code into a javascript function and just call it from within with the RegisterClientScriptBlock method in ClientScript class:

Daclare the window.open function:

And from within the code behind class just a gateway caller to this function like:

void MessageGateway(string URI)
{
    this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(),
        "logCallBack", @"");
}

And that's it, you may call this gateway with your stuff as normally you do,

MessageGateway(string.Format("../IRMQueryPO.aspx?id={0}", e.Item.Cells[2].Text));

You can try tweeking the "target" parameter with "_blank" in order to open a tab instead a window, it's just a matter of the flavor your solution points in.