Inserting multiple textbox data into an Excel file

Question

I want to write a program that saves the text in textbox to an Excel file using a loop because I want to insert multiple text into Excel. I found codes but it only overwrites data in cells. I want the program to find the last row and insert new data into the next row. I'm stuck here, please someone help me how to do that in c#.

object misValue = System.Reflection.Missing.Value;

xlApp = new Excel.ApplicationClass();
xlWorkBook = xlApp.Workbooks.Add(misValue);
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);

xlWorkSheet.Cells[1, 1] = "FirstName";
xlWorkSheet.Cells[1, 2] = "LastName";
xlWorkSheet.Cells[1, 3] = "JobTitle";
xlWorkSheet.Cells[1, 4] = "Address";

for (int i=2; i<=6; i++)
{
    xlWorkSheet.Cells[i, 1] = textBox1.Text;
    xlWorkSheet.Cells[i, 2] = textBox2.Text;
    xlWorkSheet.Cells[i, 3] = textBox3.Text;
    xlWorkSheet.Cells[i, 4] = textBox4.Text;
}

Answer 1

Like I mentioned that you don't need to use a loop. See this example

Let's say your form looks like this.

Code: (TRIED AND TESTED)

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Excel = Microsoft.Office.Interop.Excel;

Namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        Microsoft.Office.Interop.Excel.Application xlexcel;
        Microsoft.Office.Interop.Excel.Workbook xlWorkBook;
        Microsoft.Office.Interop.Excel.Worksheet xlWorkSheet;
        object misValue = System.Reflection.Missing.Value;

        Public Form1()
        {
            InitializeComponent();
        }

        //~~> Open File
        private void button1_Click(object sender, EventArgs e)
        {
            xlexcel = new Excel.Application();

            xlexcel.Visible = true;

            // Open a File
            xlWorkBook = xlexcel.Workbooks.Open("C:\\MyFile.xlsx", 0, true, 5, "", "", true,
            Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, 1, 0);

            xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);

            xlWorkSheet.Cells[1, 1] = "FirstName";
            xlWorkSheet.Cells[1, 2] = "LastName";
            xlWorkSheet.Cells[1, 3] = "JobTitle";
            xlWorkSheet.Cells[1, 4] = "Address";
        }

        //~~> Add Data
        private void button2_Click(object sender, EventArgs e)
        {
            int _lastRow = xlWorkSheet.Range["A" + xlWorkSheet.Rows.Count].End[Excel.XlDirection.xlUp].Row + 1 ;

            xlWorkSheet.Cells[_lastRow, 1] = textBox1.Text;
            xlWorkSheet.Cells[_lastRow, 2] = textBox2.Text;
            xlWorkSheet.Cells[_lastRow, 3] = textBox3.Text;
            xlWorkSheet.Cells[_lastRow, 4] = textBox4.Text;
        }

        //~~> Once done close and quit Excel
        private void button3_Click(object sender, EventArgs e)
        {
            xlWorkBook.Close(true, misValue, misValue);
            xlexcel.Quit();

            releaseObject(xlWorkSheet);
            releaseObject(xlWorkBook);
            releaseObject(xlexcel);
        }

        private void releaseObject(object obj)
        {
            try
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);
                obj = null;
            }
            catch (Exception ex)
            {
                obj = null;
                MessageBox.Show("Unable to release the Object " + ex.ToString());
            }
            finally
            {
                GC.Collect();
            }
        }
    }
}

FOLLOWUP FROM COMMENTS

Range object is a part of worksheet object. So you shouldn't be getting any errors there. And Like I mentioned above, the code is tried and tested.

MORE FOLLOWUP (From Comments)

The above code was tested on VS 2010 Ultimate. If you have VS 2008 then replace the line

int _lastRow = xlWorkSheet.Cells[xlWorkSheet.Rows.Count,
               1].End[Excel.XlDirection.xlUp].Row + 1;

with

int _lastRow = xlWorkSheet.Cells.Find(
                                      "*",
                                      xlWorkSheet.Cells[1,1],
                                      Excel.XlFindLookIn.xlFormulas,
                                      Excel.XlLookAt.xlPart,
                                      Excel.XlSearchOrder.xlByRows,
                                      Excel.XlSearchDirection.xlPrevious,
                                      misValue,
                                      misValue,
                                      misValue
                                      ).Row + 1 ;

Answer 2

Your main concern is to find the last used row in your excel.

For that you can use

 Excel.Range usedRange = xlWorkSheet .UsedRange;
 Excel.Range _lastCell= usedRange.SpecialCells(Excel.XlCellType.xlCellTypeLastCell,  
 Type.Missing);

  int _lastRow= lastCell.Row; // Gives you the last used row in your Excel sheet
  int _lastCol = lastCell.Column; // Give you the last used column



 _lastRow++; // To get the next row 

    for (int i=_lastRow; i<=_lastrow+6; i++) // Set your i value to _lastRow
    {
        xlWorkSheet.Cells[i, 1] = textBox1.Text;
        xlWorkSheet.Cells[i, 2] = textBox2.Text;
        xlWorkSheet.Cells[i, 3] = textBox3.Text;
        xlWorkSheet.Cells[i, 4] = textBox4.Text;
    }