Help with my code - Distance Finder Program

This is what i got so far:

Code:

//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