how to send textbox values vs2010 to xl for specfied cell

public Form1()

{

InitializeComponent();

}

private void button1_Click(object sender, EventArgs e)

{

Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();

if (xlApp == null)

{

MessageBox.Show("Excel is not properly installed!!");

return;

}

Excel.Workbook xlWorkBook;

Excel.Worksheet xlWorkSheet;

object misValue = System.Reflection.Missing.Value;

xlWorkBook = xlApp.Workbooks.Add(misValue);

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

xlWorkSheet.Cells[1, 1] = "DATE";

xlWorkSheet.Cells[1, 2] = "ROTOR";

xlWorkSheet.Cells[1, 3] = "STATOR";

int i=5;

for (i = 0; i <0; i++)

if (str1 == "R")

{

xlWorkSheet.Cells[2, 2] = textBox1.Text;

}

else if(str1 == "S")

{

xlWorkSheet.Cells[2, 3] =textBox2.Text;

}

xlWorkBook.SaveAs("E:\\SCANNER\\Book1.xls", Excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);

xlWorkBook.Close(true, misValue, misValue);

xlApp.Quit();

Marshal.ReleaseComObject(xlWorkSheet);

Marshal.ReleaseComObject(xlWorkBook);

Marshal.ReleaseComObject(xlApp);

MessageBox.Show("Excel file created , you can find the file E:\\scanner\\Book1.xls");

string filename = "Book1.xls"+ DateTime.Now.ToString("ddmmyyyy") + "Book1.xls";

}

private void Form1_Load(object sender, EventArgs e)

{

}

private void textBox1_TextChanged(object sender, EventArgs e)

{

if (textBox1.Text.Length == 7)

textBox2.Focus();

BarCode1 = textBox1.Text;

if (BarCode1.Length > 0)

{

}

}

private void textBox2_TextChanged_1(object sender, EventArgs e)

{

if (textBox2.Text.Length == 7)

textBox3.Focus();

BarCode2 = textBox2.Text;

if (BarCode2.Length > 0)

{

}

}

private void textBox3_TextChanged_1(object sender, EventArgs e)

{

if (textBox3.Text.Length == 7)

textBox3.Focus();

BarCode3 = textBox3.Text;

if (BarCode3.Length > 0)

{

}

}

}

}

this i try for copying textbox to excel 

it open excel worksheet but it wont come a values soo plss help me frds