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Sets the priority value for this conditional formatting rule to "1" so that it will be evaluated before all other rules on the worksheet.
void SetFirstPriority()
Sub SetFirstPriority()
worksheet.Range["A1:B3"].Value = new object[,] {{10, 5}, {30, 15}, {20, 25}};
IDataBar firstDataBar = worksheet.Range["A1:A3"].FormatConditions.AddDatabar();
IDataBar secondDataBar = worksheet.Range["B1:B3"].FormatConditions.AddDatabar();
firstDataBar.SetFirstPriority();