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it's a file, see attached. first line goes as a legend for my columns, so disregard them, I omitted some code

I am trying to convert string array to a double array. I am not succeeding as I am getting the exeption of System.FormatException was unhandled
Message=Input string was not in a correct format.
...

and how do I add code as a code window in this forum? sorry for ignorance

Right, very useful. So I am trying to read an external data file filled with numbers into a DataTable. It all ends up quite ugly.

First, I can't add the data as x and y (or possibly many y values)...

OK, #1 and #2:

I created a dataset

public class Text2DataSet
{
public static DataSet Convert2DataSet(string tableName)
{
DataSet ds = new DataSet();

not much luck. I have tab separated x-y text file and I need to plot it. I do not know how to feed that file into chart control

then this is exactly what I am going to do: study chart control. I'll come back and complain here (which I do very well) if I fail again
any useful link for chart control?

Much better. Now there is no exception.

One question is: how do I step through routine?
The other, bigger problem is: there is still no draing generated. I created windows forms window with two...

sure. I am getting:

Input string was not in a correct format.

All I want to do is to import data set into datagridview (which I do successfully) and then plot it connecting points with lines

OK, simplified everything. How would I use OnPaint and DrawLine to plot data from DataGridView? The code below gives me exception that

float x2 = Convert.ToSingle(
...

I meant DataSeries:

//e.Graphics.DrawLines(Pen, PointF(x,y));
base.OnPaint(e);
}

and DataSeries:

namespace Example8_3
{

I would like to try plotting x and multiple y data from data residing in DataGridView. I populate datagridview but have no idea how to handle an event to get it plotted. I am using windows forms. I...