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My Program does not insert '00' to my excel [duplicate]

I am losing the leading zeros when I copy values from a datatable to an Excel sheet. That's because probably Excel treats the values as a number instead of text.
I am copying the values like so:
myWorksheet.Cells[i + 2, j] = dtCustomers.Rows[i][j - 1].ToString();
How do I format a whole column or each cell as Text?
A related question, how to cast myWorksheet.Cells[i + 2, j] to show a style property in Intellisense?

Below is some code to format columns A and C as text in SpreadsheetGear for .NET which has an API which is similar to Excel - except for the fact that SpreadsheetGear is frequently more strongly typed. It should not be too hard to figure out how to convert this to work with Excel / COM:
IWorkbook workbook = Factory.GetWorkbook();
IRange cells = workbook.Worksheets[0].Cells;
// Format column A as text.
cells["A:A"].NumberFormat = "#";
// Set A2 to text with a leading '0'.
cells["A2"].Value = "01234567890123456789";
// Format column C as text (SpreadsheetGear uses 0 based indexes - Excel uses 1 based indexes).
cells[0, 2].EntireColumn.NumberFormat = "#";
// Set C3 to text with a leading '0'.
cells[2, 2].Value = "01234567890123456789";
workbook.SaveAs(#"c:\tmp\TextFormat.xlsx", FileFormat.OpenXMLWorkbook);
Disclaimer: I own SpreadsheetGear LLC

If you set the cell formatting to Text prior to adding a numeric value with a leading zero, the leading zero is retained without having to skew results by adding an apostrophe. If you try and manually add a leading zero value to a default sheet in Excel and then convert it to text, the leading zero is removed. If you convert the cell to Text first, then add your value, it is fine. Same principle applies when doing it programatically.
// Pull in all the cells of the worksheet
Range cells = xlWorkBook.Worksheets[1].Cells;
// set each cell's format to Text
cells.NumberFormat = "#";
// reset horizontal alignment to the right
cells.HorizontalAlignment = XlHAlign.xlHAlignRight;
// now add values to the worksheet
for (i = 0; i <= dataGridView1.RowCount - 1; i++)
{
for (j = 0; j <= dataGridView1.ColumnCount - 1; j++)
{
DataGridViewCell cell = dataGridView1[j, i];
xlWorkSheet.Cells[i + 1, j + 1] = cell.Value.ToString();
}
}

Solution that worked for me for Excel Interop:
myWorksheet.Columns[j].NumberFormat = "#"; // column as a text
myWorksheet.Cells[i + 2, j].NumberFormat = "#"; // cell as a text
This code should run before putting data to Excel. Column and row numbers are 1-based.
A bit more details. Whereas accepted response with reference for SpreadsheetGear looks almost correct, I had two concerns about it:
I am not using SpreadsheetGear. I was interested in regular Excel
communication thru Excel interop without any 3rdparty libraries,
I was searching for the way to format column by number, not using
ranges like "A:A".

Before your write to Excel need to change the format:
xlApp = New Excel.Application
xlWorkSheet = xlWorkBook.Sheets("Sheet1")
Dim cells As Excel.Range = xlWorkSheet.Cells
'set each cell's format to Text
cells.NumberFormat = "#"
'reset horizontal alignment to the right
cells.HorizontalAlignment = Excel.XlHAlign.xlHAlignRight

I've recently battled with this problem as well, and I've learned two things about the above suggestions.
Setting the numberFormatting to # causes Excel to left-align the value, and read it as if it were text, however, it still truncates the leading zero.
Adding an apostrophe at the beginning results in Excel treating it as text and retains the zero, and then applies the default text format, solving both problems.
The misleading aspect of this is that you now have a different value in the cell. Fortuately, when you copy/paste or export to CSV, the apostrophe is not included.
Conclusion: use the apostrophe, not the numberFormatting in order to retain the leading zeros.

Use your WorkSheet.Columns.NumberFormat, and set it to string "#", here is the sample:
Excel._Worksheet workSheet = (Excel._Worksheet)_Excel.Worksheets.Add();
//set columns format to text format
workSheet.Columns.NumberFormat = "#";
Note: this text format will apply for your hole excel sheet!
If you want a particular column to apply the text format, for example, the first column, you can do this:
workSheet.Columns[0].NumberFormat = "#";
or this will apply the specified range of woorkSheet to text format:
workSheet.get_Range("A1", "D1").NumberFormat = "#";

if (dtCustomers.Columns[j - 1].DataType != typeof(decimal) && dtCustomers.Columns[j - 1].DataType != typeof(int))
{
myWorksheet.Cells[i + 2, j].NumberFormat = "#";
}

I know this question is aged, still, I would like to contribute.
Applying Range.NumberFormat = "#" just partially solve the problem:
Yes, if you place the focus on a cell of the range, you will read text in the format menu
Yes, it align the data to the left
But if you use the type formula to check the type of the value in the cell, it will return 1 meaning number
Applying the apostroph behave better. It sets the format to text, it align data to left and if you check the format of the value in the cell using the type formula, it will return 2 meaning text

//where [1] - column number which you want to make text
ExcelWorksheet.Columns[1].NumberFormat = "#";
//If you want to format a particular column in all sheets in a workbook - use below code. Remove loop for single sheet along with slight changes.
//path were excel file is kept
string ResultsFilePath = #"C:\\Users\\krakhil\\Desktop\\TGUW EXCEL\\TEST";
Excel.Application ExcelApp = new Excel.Application();
Excel.Workbook ExcelWorkbook = ExcelApp.Workbooks.Open(ResultsFilePath);
ExcelApp.Visible = true;
//Looping through all available sheets
foreach (Excel.Worksheet ExcelWorksheet in ExcelWorkbook.Sheets)
{
//Selecting the worksheet where we want to perform action
ExcelWorksheet.Select(Type.Missing);
ExcelWorksheet.Columns[1].NumberFormat = "#";
}
//saving excel file using Interop
ExcelWorkbook.Save();
//closing file and releasing resources
ExcelWorkbook.Close(Type.Missing, Type.Missing, Type.Missing);
Marshal.FinalReleaseComObject(ExcelWorkbook);
ExcelApp.Quit();
Marshal.FinalReleaseComObject(ExcelApp);

You need to format the column to be a string.
You can use the link https://supportcenter.devexpress.com/ticket/details/t679279/import-from-excel-to-gridview
For converting the ExcelDataSource, you can also refer to https://supportcenter.devexpress.com/ticket/details/t468253/how-to-convert-exceldatasource-to-datatable

EPPlus How to add LineSeries with specific range of data from worksheet

I create an Excel file in code. So far, everything works out fine.
Created excel file (image)
I want to create the following chart in code
Excel with Chart (image)
(Notice the selected cells and xseries names)
In Excel its easy.
But how do I do that in code?
My experiment
string values = "='Overall Results'!B3;'Overall Results'!D3;'Overall Results'!F3;'Overall Results'!H3;'Overall Results'!J3";
string xSerie = "='Overall Results'!$B$1:$K$1";
linechart.Series.Add(values, xSerie);
didn't work.

You have to create a string with the EPPlus cell adresses.
string values = worksheet.Cells[3, 2].Address + ":" + worksheet.Cells[3, 4].Address + ":" + worksheet.Cells[3, 6].Address;
linechart.Series.Add(values, ExcelRange.GetAddress(1, 2, 1, 11));

Had this problem aswell, but i found a solution:
For some reason, in order to get multiple specific cells in EPPlus, every cell has to be in a range.
So creating multiple ranges, which each only contains 1 cell, is the way to go
string values = "sheetName!B3:sheetName!B3,sheetName!D3:sheetName!D3,sheetName!F3:sheetName!F3,sheetName!H3:sheetName!H3,sheetName!J3:sheetName!J3";
var valueCells = sheet.Cells[values];
string xSerie = (Same concept);
var xCells = sheet.Cells[xSerie];
linechart.Series.Add(valueCells, xCells);

Conditional formatting to entire row

I have a code in C# with EPPLUS for Excel that fills a cell green if the value of the cell is over 100. It works:
ExcelAddress _formatRangeAddress = new ExcelAddress("G4:G" + (c.Count + 4));
string _statement = "IF(G4>100,1,0)";
var _cond2 = hoja.ConditionalFormatting.AddExpression(_formatRangeAddress);
_cond2.Style.Fill.PatternType = OfficeOpenXml.Style.ExcelFillStyle.Solid;
_cond2.Style.Fill.BackgroundColor.Color = System.Drawing.Color.LimeGreen;
_cond2.Formula = _statement;
But what I really need is to fill the entire row. If I change the range:
ExcelAddress _formatRangeAddress = new ExcelAddress("A4:G" + (c.Count + 4));
Applies only for the cells in the A column, not to the entire row.
What I am doing wrong?

Make the reference to G4 absolute otherwise the formula will be apply relative to that cell. So change this line:
string _statement = "IF(G4>100,1,0)";
to apply to the entire row based ONLY on G4
string _statement = "IF($G$4>100,1,0)";
(Response to Comments)
to apply to entire rows relative to row number but keep the column fixed to G:
string _statement = "IF($G4>100,1,0)";

How to write long numbers as text with interop.excel

I am using interop.excel dll and creating an Excel file. I am having issues while writing long numbers as text.
Below is the code I am using. I can use apostrophe, but if you look in formula bar, you can see the cell is formatted.
Is there any other way of writing long numbers to an Excel spreadsheet without seeing the formatted value in the formula bar (using numberformat)?
worksheet.Cells[i, j] = "'" + dr[p];
//var startCell = (Excel.Range)worksheet.Cells[i, j];
//var endCell = (Excel.Range)worksheet.Cells[i, j];
//worksheetRange = worksheet.get_Range(startCell, endCell);
//worksheetRange.NumberFormat = "#####";

If you wanted to do it in one line, you could use the Text function.
Example:
worksheets.Cells[i, j] = "=Text(" + dr[p] + ", \"#\"";
But that probably isn't what you're looking for because this would store the number as a text and display the formula in the formula bar. In that case, like user194076 suggested, you could use .NumberFormat = "#";
or .NumberFormat = "#"; if you don't want it to show in scientific notation.

You can use NumberFormat with '#' or '#'
Example:
Range r= worksheet.Cells;
r.NumberFormat = "#";

NPOI Excel number format not showing in Excel sheet in asp.net

I am trying to create double and number format cells in excel using NPOI library. I used code like
Dim cell As HSSFCell = row.CreateCell(j)
cell.SetCellValue(Double.Parse(dr(col).ToString))
In excel numbers are aligning right but when I check format it is showing in "General"
then I changed my code to like below
Dim cell As HSSFCell = row.CreateCell(j)
cell.SetCellValue(Double.Parse(dr(col).ToString))
Dim cellStyle As HSSFCellStyle = hssfworkbook.CreateCellStyle
cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("#,#0.0")
cell.CellStyle = cellStyle
Then While opening file it is giving error and also taking so long to open. But Excel format showing in "Number"
error showing is like below.
How to fix this?

Take a look at this, are you creating a cellStyle object for each cell? If so don't. Try creating just a couple of styles before creating your cells and then apply these pre-defined styles to the cells you create.

To fix the too many different cell styles declare all styles outside of any loop you may be running.
I'm presumeing you 'j' would be the enumerator so i'll drop what you had in a corrected format for you.
Dim cellStyle As HSSFCellStyle = hssfworkbook.CreateCellStyle
cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("#,#0.0")
For col = 0 To ColoumCounter
For j = 0 To Counter
Dim cell As HSSFCell = row.CreateCell(j)
cell.SetCellValue(Double.Parse(dr(col).ToString))
cell.CellStyle = cellStyle
Next
Next
This should work a bit better, by limiting the number of "New" styles.

Hare is a simple way to create double format in Excel Document USING NPOI.
//make NUMERIC Format in Excel Document // Author: Akavrelishvili
var eRow = sheet.CreateRow(rowIndex); //create new Row , rowIndex - it's integer, like : 1,2,3
eRow.CreateCell(0).SetCellValue(row["ProvidName"].ToString()); //create cell and set string value
double Amount = Convert.ToDouble(row["Amount"].ToString()); //convert string to double
eRow.CreateCell(1).SetCellValue(Amount); // create cell and set double value.
This is working version, I have used it a lots of projects.
Very Hard is to insert DateTime format in Excel, There no good example in Internet and I think it helps people to do it right way.
I show you code example:
//make Date Time Format in Excel Document // Author: Akavrelishvili
var eRow = sheet.CreateRow(rowIndex); //create new Row // rowIndex - it's integer, like : 1,2,3
ICellStyle cellDateStyle = workBook.CreateCellStyle(); //create custom style
cellDateStyle.DataFormat = workBook.CreateDataFormat().GetFormat("dd/mm/yyyy"); //set day time Format
eRow.CreateCell(3).SetCellValue(Convert.ToDateTime(row["Date"])); //set DateTime value to cell
eRow.GetCell(6).CellStyle = cellDateStyle; // Restyle cell using "cellDateStyle"
I hope it helps

Create a style then but this style for the column
ICellStyle _TextCellStyle = wb1.CreateCellStyle();
_TextCellStyle.DataFormat = wb1.CreateDataFormat().GetFormat("#");
sheet.SetDefaultColumnStyle(2, _TextCellStyle);