want to update the data in excel to db.but small change

public ActionResult categoryimp()

{

_Workbook workBook = null;

_Worksheet workSheet = null;

Range cellsRange = null;

Range columnRange = null;

Range rowRange = null;

int numberOfColumns = 0;

int numberOfRows = 0;

var excelApp = new Application();

List obj = new List();

List items = new List();

try

{

workBook = excelApp.Workbooks.Open("D:/excelnew", 0, true, 5, "", "", true, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, 1, 0);

workSheet = (Worksheet)workBook.Worksheets.get_Item(1);

cellsRange = workSheet.Cells;

columnRange = cellsRange.Columns;

rowRange = cellsRange.Rows;

numberOfColumns = columnRange.Count;

numberOfRows = rowRange.Count;

Range objRange = null;

object[] data = null;

int totalColumns = workSheet.UsedRange.Cells.Columns.Count + 1;

//Iterating from row 2 because first row contains HeaderNames

Categorydescription item = new Categorydescription();

for (int row = 2; row < workSheet.UsedRange.Cells.Rows.Count; row++)

{

item = new Categorydescription();

data = new object[totalColumns - 1];

for (int col = 1; col < totalColumns; col++)

{

objRange = workSheet.Cells[row, col];

if (objRange.MergeCells)

{

data[col - 1] = Convert.ToString(((Range)objRange.MergeArea[1, 1]).Text).Trim();

}

else

{

data[col - 1] = Convert.ToString(objRange.Text).Trim();

}

if (col == 1)

{

item.city= Convert.ToString(objRange.Text).Trim();

}

if (col == 2)

{

item.belts= Convert.ToString(objRange.Text).Trim();

}

if (col == 3)

{

item.Metadescription = Convert.ToString(objRange.Text).Trim();

}

}

items.Add(item);

}

string s = String.Format(

"There are {0} columns and {1} rows in the Worksheet",

numberOfColumns, numberOfRows);

}

finally

{

}

CategorydescDataContext db = new CategorydescDataContext();

db.Categorydescriptions.InsertAllOnSubmit(items);

db.SubmitChanges();

return View();

}

}

}