Develop Reference

Output showing System.Windows.Form.Label after every word

I am having a problem where the user enters his inputs into a text box (like a name). If the name is Jim Bob it will output like Jim System.Windows.Form.Label Bob System.Windows.Form.Label. I searched the properties tab and I am following along from the book but they do not have the same problem I have. I added some code below but I don't think it has anything to do with the problem.
string output;
output = textBoxPrefT.Text + ". " + textBoxFirstN + " " + textBoxMiddleN + " " + textBoxLastN;
labelOutput.Text = output;

You have to include .Text for all textboxes so it should look like this
string output;
output = textBoxPrefT.Text + ". " + textBoxFirstN.Text + " " + textBoxMiddleN.Text + " " + textBoxLastN.Text;
labelOutput.Text = output;

Prevent last key in string to have a comma

Having trouble figuring out how to prevent the last key in my array to not have a comma. Since its being exported to a .Json file the last key shouldn't have a ",".
I know you can detect it by using .Last();, but I can't seem to make that work. Any recommendations?
//Data Path
string dataPath = #"..\..\FileIOExtraFiles\DataFieldsLayout.txt";
string[] dataList = File.ReadAllLines(dataPath);
//save Data data
using (StreamWriter outStream = new StreamWriter(outputFolder + #"\CharacterStringData3.json"))
{
outStream.WriteLine("{");
for (int i = 0; i < dataFile.Length; i++)
{
string s = dataFile[i];
char last = s.Last();
if (s == "")
{
outStream.WriteLine("\"" + dataList[i] + "\"" + " : " + "\" \",");
}
else
{
outStream.WriteLine("\"" + dataList[i] + "\"" + " : \"" + s + "\",");
}
}
outStream.WriteLine("}");
}
Output:
{
"data1":"item1",
"data2":item2",
"lastKey":item3",//trying to remove comma from last key in array.
}

As others have pointed out, it doesn't make sense that you are building json manually, but given that this is a question more about technique, here is one approach: you could change it to this:
var commaSuffix = (i == dataFile.Length - 1) ? "," : string.Empty;
outStream.WriteLine("\"" + dataList[i] + "\"" + " : \"" + s + "\"" + commaSuffix);
The suffix would be used on every iteration except the last.

Change this
outStream.WriteLine("\"" + dataList[i] + "\"" + " : " + "\" \",");
To this
outStream.WriteLine("\"" + dataList[i] + "\"" + " : " + "\" \""+(i==dataFile.Length?",":""));

Instead of using outStream.WriteLine() at every step, store it in a string. Then you can remove the last comma from that string and write the whole string at once:
//Get last index of comma
int lastCommaIndex = outputString.LastIndexOf(',');
//Create new StringBuilder with everything before the last comma
StringBuilder sb = new StringBuilder(outputString.Substring(0,lastCommaIndex));
//Add everything after the last comma, or just add a closing brace
//sb.Append("}"); //This instead of next line
sb.Append(outputString.Substring(lastCommaIndex+1));
//Add contents of StringBuilder to the Stream
outSteam.WriteLine(sb);

File is created but information wont save in it

Ok, so I'm new to C# and don't know what I'm doing wrong.
At the top of the button click event I have this variable:
InformationDump infodump;
infodump = new InformationDump();
After that I have the rest of the code which is meant to path to the user desktop and save whatever is filled out in the textbox's into a separate window (part of the same program):
infodump.richTextBox1.Text = textBox1.Text + ", " + textBox2.Text + ", " + textBox3.Text + ", " + textBox4.Text + ", " + comboBox1.SelectedItem;
string path = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
string filename = path + "\\" + DateTime.Now.ToString("HH.mm.ss") + System.Environment.UserName + ".txt";
infodump.richTextBox1.SaveFile(filename, RichTextBoxStreamType.RichText);
Thanks in advance.

This is happening because you are creating an instance of the form (InformationDump) then try to use the RichTextBox instance but the form then will not go through the standard loading and initialization process therefore as I reproduced, the file will be created but will be empty.
It is very interesting, but if you do repeated save it works!
infodump.richTextBox1.SaveFile(filename, RichTextBoxStreamType.RichText);
// zero bytes
infodump.richTextBox1.SaveFile(filename, RichTextBoxStreamType.RichText);
// works!

C# take output and put it into CSV file

I have some code that is currently doing the following at the end of the code:
Console.WriteLine(vid.totalCurrentCharges + " : " + vid.assetId + " : " + vid.componentName + " : " + vid.recurringCharge);
Console.readline().
I need to take the output of vid.totalCurrentCharges + " : " + vid.assetId + " : " + vid.componentName + " : " + vid.recurringCharge, and write It to a csv file. Can someone here help with this? Currently all it is doing is writing the output to console.

Instead of Console.Writeline you need to create StreamWriter. Just like this:
using (StreamWriter writer = new StreamWriter("important.csv"))
{
//probably a loop here
writer.WriteLine(vid.totalCurrentCharges + " , " + vid.assetId + " , " + vid.componentName + " , " + vid.recurringCharge);
}
Moreover you can use String.Join to concatenate strings instead of "adding" them, so above WriteLine can be converted into:
writer.WriteLine(String.Join(",", vid.totalCurrentCharges, vid.assetId, vid.componentName, vid.recurringCharge));

Create a dropdownlist of checkboxes using EPPlus

I am using EPPlus (http://epplus.codeplex.com/) to create Excel files in my ASP.NET application. I was wondering if anyone knows if it's possible to create a dropdownlist with checkboxes in one cell. I've checked the documentation, but found nothing so far. I've also tried Googling it but haven't found anything in the right direction yet.
This question on their forum is actually a pretty good demonstration of what I'm looking for, but it hasn't received any answers: http://epplus.codeplex.com/discussions/585879
Does anyone happen to have any ideas and can point me in the right direction?

You can use:
var validationCell = sheet.DataValidations.AddListValidation("A1");
validationCell.Formula.Values.Add("a");
validationCell.Formula.Values.Add("b");
validationCell.Formula.Values.Add("c");
...
but you can choose only one single value. I think that multiple values are not supported by excel.

For others reference, here is how I could enable multiple values select:
By inserting VBA Code:
see how to do it in here , using EPPlus you can insert VBA code using something like:
package.Workbook.CreateVBAProject();
worksheet.CodeModule.Code = code;
This following code did the trick:
using (var package = new ExcelPackage(new System.IO.FileInfo("D:\\b.xlsm")))
{
ExcelWorksheet worksheet = package.Workbook.Worksheets.Add("11");
var validationCell = worksheet.DataValidations.AddListValidation("A1");
validationCell.Formula.Values.Add("a");
validationCell.Formula.Values.Add("b");
validationCell.Formula.Values.Add("c");
string code = "Private Sub Worksheet_Change(ByVal Target As Range)\n" +
"Dim Oldvalue As String\n" +
"Dim Newvalue As String\n" +
"Application.EnableEvents = True\n" +
"On Error GoTo Exitsub\n" +
"If Target.Address = \"$A$1\" Then\n" +
" If Target.SpecialCells(xlCellTypeAllValidation) Is Nothing Then\n" +
" GoTo Exitsub\n" +
"Else: If Target.Value = \"\" Then GoTo Exitsub Else\n" +
" Application.EnableEvents = False\n" +
"Newvalue = Target.Value\n" +
"Application.Undo\n" +
"Oldvalue = Target.Value\n" +
" If Oldvalue = \"\" Then\n" +
" Target.Value = Newvalue\n" +
"Else\n" +
" If InStr(1, Oldvalue, Newvalue) = 0 Then\n" +
" Target.Value = Oldvalue & \", \" & Newvalue\n" +
"Else: \n" +
" Target.Value = Oldvalue\n" +
"End If\n" +
"End If\n" +
"End If\n" +
"End If\n" +
"Application.EnableEvents = True\n" +
"Exitsub: \n" +
" Application.EnableEvents = True\n" +
"End Sub";
package.Workbook.CreateVBAProject();
worksheet.CodeModule.Code = code;
package.Save();
}