Help with my code - Distance Finder Program

[rob316]

This is what i got so far:

//Open the files
System.IO.StreamReader fileCities = new System.IO.StreamReader
(@"C:\Cities.txt");
System.IO.StreamReader fileDistances = new System.IO.StreamReader
(@"C:\Distances.txt");


//Read the files
string strCities = fileCities.ReadToEnd();
string strDistances = fileDistances.ReadToEnd();

//Close the files
fileCities.Close();
fileDistances.Close();

//Split Cities into an array of lines using ASCII 10 as the delimiter

string[] strCitiesLines = strCities.Split((Char)10);
string[] strDistancesLines = strDistances.Split((Char)10);

//Set up the array for the distances matrix

lngDistances = new long[strCitiesLines.Length - 1, strCitiesLines.Length - 1];

//Collect city name without whitespace

strCities = strCitiesLines[intCities].Trim();

//Check it has a valid length

if(strCities.Length > 0)
{
    //Add to both of the text boxes
    
    cmbStart.Items.Add(strCities);
    cmbFinish.Items.Add(strCities);
    
    //Collect the distance values for each city
    
    strDistances = strDistancesLines[intCities].Split(Convert.ToChar(","));
    
    //Add the values to the distances array
    
    lngDistances[intCities - 1, intDistance] = long.Parse(strDistances[intDistance]);
    
    //Get the result from the array
    
    try
    {
    txtDistance.Text = lngDistances[cmbStart.SelectedIndex,cmbStart.SelectedIndex.ToString()];
    }
    catch(Exception ex)
    {
    MessageBox.Show("Error - Please select the 2 cities first");
}

I'm getting errors, i need to know how to correct these. I know i need to add a loop but not sure how. Help anyone?

Edit: Added formatting for clarity - Hack