The FindMinValue and FindMaxValue methods can be used to find the index of the min and max values of a data series. The methods will raise an exception if you try to invoke them on a data series, which does not contain double values. Both methods return the index of the min or max value contained in the series. Following is an example of their usage:

int minIndex = bar.Values.FindMinValue();
int maxIndex = bar.Values.FindMaxValue();

Dim minIndex As Integer = bar.Values.FindMinValue()
Dim maxIndex As Integer = bar.Values.FindMaxValue()

You can obtain the index of the first appearance of a specific value with the help of the FindValue and FindString methods of the NDataSeries class. If the specified value or string is not found in the data series the methods will return -1.

int nFirstIndex = bar.Values.FindValue(43);
if (nFirstIndex == -1)
{
   // do something if value 43 not found
   ...
}
else
{
   // do something if value 43 is found
   ...
}

nFirstIndex = bar.Labels.FindString("LabelToSearchFor");
if (nFirstIndex == -1)
{
   // do something if label is not found
   ...
}
else
{
   // do something if label is found
   ...
}

Dim nFirstIndex As Integer =  bar.Values.FindValue(43)
If nFirstIndex = -1 Then
   ' do something if value 43 not found
   ...
Else
   ' do something if value 43 is found
   ...
End If

nFirstIndex = bar.Labels.FindString("LabelToSearchFor")
If nFirstIndex = -1 Then
   ' do something if label is not found
   ...
Else
   ' do something if label is found
   ...
End If

The FindValue or FindString methods have two overloads, with which you can specify a start index from which the search must begin. The following example will find the indexes of all data items with value 12.

int curIndex = bar.Values.FindValue(43);
ArrayList indexArray = new ArrayList();

while (curIndex != -1)
{
   indexArray.Add(curIndex);
   curIndex = bar.Values.FindValue(43, curIndex + 1);
}

Dim curIndex As Integer =  bar.Values.FindValue(43)
Dim indexArray As ArrayList =  New ArrayList()

While curIndex <> -1
   indexArray.Add(curIndex)
   curIndex = bar.Values.FindValue(43, curIndex + 1)
End While