If you are using MSChart to display your data in chart and want some numerical value to display in the label or tooltip with two decimal places then set them as shown below (c# code snippet):
// Set tooltip with value from x axis & y axis
this.Chart1.Series[“Series1″].ToolTip = “#VALX” + “(” + “#VALY{0.##}” + ” GB )”;
// Set Label value with value from x axis & y axis
this.Chart1.Series[“Series1″].Label = “#VALX” + “(” + “#VALY{0.##}” + ” GB )”;
And the diagram will be as shown below
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