This took me a while to figure out, so I am putting it here for prosperity. This is how to get the value of a specific column in a jqGrid selected Row;

ondblClickRow: function(id, rowid) {
    var ret = $("#grid").getRowData(id);
    window.location = '/Clients/Details/' + ret.ClientID;
}

Enjoy!

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jqGrid get Row Column Value, 8.4 out of 10 based on 11 ratings