Set Percentage Width for Box Plot Chart

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C#

ASP.NET

Javascript

chart

hi all,

does anyone know how can I set the chart width to percentage 70%? I have tried to set tab container percentage to 100% and it works. but when I used the same method for chart, no chart is being generated out. When I set the chart width in pixel, it works. But I want to set the chart width in percentage instead of pixel.

This is my codes:

//Cs file: 

 AjaxControlToolkit.TabContainer container = new AjaxControlToolkit.TabContainer();
            container.ID = "TabContainer";
            container.EnableViewState = false;
            container.Tabs.Clear();
            container.Height = Unit.Pixel(1000);
            container.Width = Unit.Percentage(100);

Chart Chart1 = new Chart();
                        Chart1.DataSource = dt;
                        Chart1.Width = Unit.Percentage(70);
                        Chart1.Height = 450;

Question: How to set chart width to percentage 70%?

Appreciate if someone can help me on this, thanks a lot!!