Programmatic Creation

<asp:PlaceHolder runat="server" ID="PlaceHolder1"></asp:PlaceHolder>

protected void Page_Init(object sender, EventArgs e)
{
    //Create new RadialGauge object
    RadRadialGauge radialGauge = new RadRadialGauge();
    radialGauge.ID = "radialGauge1";

    //Set Pointer properties
    radialGauge.Pointer.Value = (decimal)0.95;
    radialGauge.Pointer.Cap.Size = (float)0.10;
    radialGauge.Pointer.Cap.Color = System.Drawing.Color.Blue;
    radialGauge.Pointer.Color = System.Drawing.Color.Blue;

    //Set Min and Max values of the Scale
    radialGauge.Scale.Min = 0;

    //In order the Max value to be displayed it should be multiple of the MajorUnit
    radialGauge.Scale.Max = (decimal)1.2;
    radialGauge.Scale.MinorUnit = (decimal)0.5;
    radialGauge.Scale.MajorUnit = (decimal)0.2;

    //Set Minor and Major Ticks properties
    radialGauge.Scale.MinorTicks.Visible = false;
    radialGauge.Scale.MajorTicks.Size = 10;

    //Set Scale Labels properties
    radialGauge.Scale.Labels.Visible = true;
    radialGauge.Scale.Labels.Font = "15px Arial,Helvetica,sans-serif";
    radialGauge.Scale.Labels.Color = System.Drawing.Color.Black;
    radialGauge.Scale.Labels.Format = "P0";
    radialGauge.Scale.Labels.Position = Telerik.Web.UI.Gauge.ScaleLabelsPosition.Outside;

    //Create new GaugeRange object
    GaugeRange gr1 = new GaugeRange();

    //Set the properties of the new object
    gr1.From = 0;
    gr1.To = (decimal)0.4;
    gr1.Color = System.Drawing.Color.Green;

    GaugeRange gr2 = new GaugeRange();
    gr2.From = (decimal)0.4;
    gr2.To = (decimal)0.8;
    gr2.Color = System.Drawing.Color.Yellow;

    GaugeRange gr3 = new GaugeRange();
    gr3.From = (decimal)0.8;
    gr3.To = (decimal)1.2;
    gr3.Color = System.Drawing.Color.FromArgb(225, 0, 0);

    //Add Gauge objects to the RadialGauge
    radialGauge.Scale.Ranges.Add(gr1);
    radialGauge.Scale.Ranges.Add(gr2);
    radialGauge.Scale.Ranges.Add(gr3);

    //Add RadialGauge object to the div wrapper
    PlaceHolder1.Controls.Add(radialGauge);
}

Protected Sub Page_Init(sender As Object, e As System.EventArgs) Handles Me.Init

    'Create new RadialGauge object
    Dim radialGauge As New RadRadialGauge()
    radialGauge.ID = "radialGauge1"

    'Set Pointer properties
    radialGauge.Pointer.Value = 0.95
    radialGauge.Pointer.Cap.Size = 0.1
    radialGauge.Pointer.Cap.Color = System.Drawing.Color.Blue
    radialGauge.Pointer.Color = System.Drawing.Color.Blue

    'Set Min and Max values of the Scale
    radialGauge.Scale.Min = 0

    'In order the Max value to be displayed it should be multiple of the MajorUnit
    radialGauge.Scale.Max = 1.2
    radialGauge.Scale.MinorUnit = 0.5
    radialGauge.Scale.MajorUnit = 0.2

    'Set Minor and Major Ticks properties
    radialGauge.Scale.MinorTicks.Visible = False
    radialGauge.Scale.MajorTicks.Size = 10

    'Set Scale Labels properties
    radialGauge.Scale.Labels.Visible = True
    radialGauge.Scale.Labels.Font = "15px Arial,Helvetica,sans-serif"
    radialGauge.Scale.Labels.Color = System.Drawing.Color.Black
    radialGauge.Scale.Labels.Format = "P0"
    radialGauge.Scale.Labels.Position = Telerik.Web.UI.Gauge.ScaleLabelsPosition.Outside

    'Create new GaugeRange object
    Dim gr1 As New GaugeRange()

    'Set the properties of the new object
    gr1.From = 0
    gr1.To = 0.4
    gr1.Color = System.Drawing.Color.Green

    Dim gr2 As New GaugeRange()
    gr2.From = 0.4
    gr2.To = 0.8
    gr2.Color = System.Drawing.Color.Yellow

    Dim gr3 As New GaugeRange()
    gr3.From = 0.8
    gr3.To = 1.2
    gr3.Color = System.Drawing.Color.FromArgb(225, 0, 0)

    'Add Gauge objects to the RadialGauge
    radialGauge.Scale.Ranges.Add(gr1)
    radialGauge.Scale.Ranges.Add(gr2)
    radialGauge.Scale.Ranges.Add(gr3)

    'Add RadialGauge object to the div wrapper
    PlaceHolder1.Controls.Add(radialGauge)

End Sub