Exponencial equation in chart from datagridview #C

See more:

DataGridView

chart

I extracted values from datagridview1 to calculate an exponential equation.

foreach (DataRow pr in Global_var.data_source.Tables[0].Rows)
{
    try
    {
        x1 = (double)pr[0];
        y1 = (double)pr[1];
        chart1.Series[1].Points.AddXY(x1, y1);
        chart1.Series[1].ChartType = SeriesChartType.Spline;
    }
    catch
    {
        x1 = 0;
        y1 = 0;
        MessageBox.Show("");
    }
} 

int number_of_rows = Global_var.data_source.Tables[0].Rows.Count;

foreach (DataRow pr in Global_var.data_source.Tables[0].Rows)
{
    xpriemer += (double)pr[0];
    lny *= (double)pr[1];
    sxy += (double)pr[0] *Math.Log((double)pr[1]);
    sxx += (double)pr[0] * (double)pr[0];
    syy += Math.Log((double)pr[1]) * Math.Log((double)pr[1]);
}        

xpriemer /= (double)number_of_rows;
xpriemer = Math.Round(xpriemer, 4);
/////////////
lny = Math.Round(lny, 4);
lnyc = Math.Log(lny) / (double)number_of_rows;
lnyc = Math.Round(lnyc, 4);
//////////
sxyc = sxy - (number_of_rows * xpriemer * lnyc);
sxyc = Math.Round(sxyc, 4);
///////////
sxxc = sxx - (number_of_rows * xpriemer * xpriemer);
sxxc = Math.Round(sxxc, 4);
///////////
B = sxyc / sxxc;
B = Math.Round(B, 4);
//////////
A = Math.Exp(lnyc - B * xpriemer);
A = Math.Round(A, 4);
////////////////
syyc = syy - number_of_rows * lnyc * lnyc;
///////
r = (sxyc / (Math.Sqrt(sxxc) * Math.Sqrt(syyc)));
r2 = sxyc * sxyc / (sxxc * syyc);

After I need to calculate Y1exponential for every row in column X1 like shown here:

y1expo = A * Math.Pow(e, B*xforeveryrow);
e = 2.71828182;

And then put the values for y1exponential to chart1. Do i need to create a second datagridview?, to put the x1,y1expo values there to create and exponential spline?

For examples i provided picture, as well a picture of my program: Picture of example and the program[Imgur]

What I have tried:

I solved everything until now, i dont know how to continue.

I tried doing something like:

pr[1] = A * Math.Pow(e, B*pr[0])

but that didnt work.