Question

I have written a code that displays 6 DataGridView tables with values from excel that contain exchange rates for euros and us dollars from 6 different banks. The exchange rates are imported from excel file. Now i have to compare each of them and display the min value for euro buy rate (Куповен курс) and max value for sell rate (Продажен/Откупен курс) and min value for dollar buy rate (Куповен курс) and max value for sell rate (Продажен/Откупен курс). I need some help with C# code that will compare those values and display them in a TextBox by clicking the Compare button.

Here is pic from my app:

http://uploadpic.org/v.php?img=CYRmqhbE6F

I tried with this code, but give me error:

private void button7_Click(object sender, EventArgs e)
    {

        string s = dataGridView1.Rows[1].Cells[1].Value.ToString();
        string t = dataGridView2.Rows[0].Cells[6].Value.ToString();
        string k = dataGridView3.Rows[0].Cells[1].Value.ToString();
        string l = dataGridView4.Rows[0].Cells[4].Value.ToString();
        string m = dataGridView5.Rows[0].Cells[2].Value.ToString();
        string n = dataGridView6.Rows[0].Cells[3].Value.ToString();



        string[] kupoven = new string[] { s,t,k,l,m,n};



        int length = kupoven.Length;

        int last = length - 1;

        int largest = kupoven[];

        for (int i = 1; i <= length / 2; i++)
        {

            if (kupoven[i] > kupoven[last] && kupoven[i] > largest) largest = arr[i];

            else if (kupoven[last] > largest) largest = kupoven[last];

            last--;

        }

        return largest;


    }

With this i put all euro values in strings(s,t,k,l,m,n), then i put them in array, and then i try to get the max value from the array. I think the problem is with type string.

Answer 1

That code you posted most likely doesn’t compile… you should always post code that compiles, unless your question is about code that’s not compiling. I would strongly recommend that you try to post sscce compliant questions: http://sscce.org/

With that said, if you want the maximum value I would do something along the lines:

private void button7_Click(object sender, EventArgs e)
{
    double s = double.Parse(dataGridView1.Rows[1].Cells[1].Value.ToString());
    double t = double.Parse(dataGridView2.Rows[0].Cells[6].Value.ToString());
    double k = double.Parse(dataGridView3.Rows[0].Cells[1].Value.ToString());
    double l = double.Parse(dataGridView4.Rows[0].Cells[4].Value.ToString());
    double m = double.Parse(dataGridView5.Rows[0].Cells[2].Value.ToString());
    double n = double.Parse(dataGridView6.Rows[0].Cells[3].Value.ToString());

    double[] kupoven = new double[] { s,t,k,l,m,n};
    double max = kupoven.Max();
}

Of course, that would only be store the maximum value in the local variable max. To display the max in a text box you would have to write some more code. I also feel like that simply displaying the maximum value may not be sufficient, given that you’re comparing the exchange rate between different banks.