retrive a excel data to sql server through an window form

public void btnBrowse_Click(object sender, EventArgs e)
        {
            string ExcelFile;
            int TotalSheets;
            Excel.Application Exapp;
            Microsoft.Office.Interop.Excel.Workbook Myworkbook;
            
            cbmFile.Items.Clear();
            txtFile.Text = "";
            try
            {
                
                OpenFileDialog1.Filter = "Excel Files (*.xls)|*.xls|All Files(*.*)|*.*";
                OpenFileDialog1.InitialDirectory = @"c:\";
                OpenFileDialog1.FileName = "Select File";
                OpenFileDialog1.Title = "Select excel file..";
                OpenFileDialog1.ShowDialog();
                ExcelFile = OpenFileDialog1.FileName; ;
                txtFile.Text = ExcelFile;
                Microsoft.Office.Interop.Excel.Application excelApp = new Microsoft.Office.Interop.Excel.Application();
                Microsoft.Office.Interop.Excel.Workbook workbook = Exapp.Workbooks.Open(ExcelFile, 0, true, 5, "", "", true, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, 1, 0);
                TotalSheets = Myworkbook.Worksheets.Count;
                foreach (Excel.Worksheet wksh in Myworkbook.Worksheets)
                {
                    cbmFile.Items.Add(wksh.Name);
                }
                Myworkbook.Close(false, false, false);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }