how to import multiple worksheets of excel file in multiple sql tables using asp.net ?

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ASP.NET

Am having one excel file with 2 different worksheets as Sheet1 and Sheet2.Now I want to import these 2 different sheet values into 2 different sql tables(k2_Sheet1,k2_Sheet2).I can able to do import only if am working with 1 sheet and and 1 table,but I want two sheets values to be imported on two tables at the same time on button click event.
My code below:

using System.Data.SqlClient;
using System.Data.OleDb;

namespace ex2sl
{
public partial class _Default : System.Web.UI.Page
{

SqlConnection conn = new SqlConnection("Data Source=User-PC;Initial Catalog=master;Integrated Security=True");
DataSet ds;
DataTable Dt;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindGrid();
}
}

private void ImporttoDatatable()
{
try
{
if (FlUploadcsv.HasFile)
{
string FileName = FlUploadcsv.FileName;
string path = string.Concat(Server.MapPath("~/Document/" + FlUploadcsv.FileName));
FlUploadcsv.PostedFile.SaveAs(path);
OleDbConnection OleDbcon = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + ";Extended Properties=Excel 12.0;");
OleDbCommand cmd = new OleDbCommand("SELECT * FROM [Sheet1$]", OleDbcon);
OleDbDataAdapter objAdapter1 = new OleDbDataAdapter(cmd);
ds = new DataSet();
objAdapter1.Fill(ds);
Dt = ds.Tables[0];
}
}
catch (Exception ex)
{

}
}


private bool ValidateDate(string date)
{
try
{
string[] dateParts = date.Split('/');
DateTime testDate = new DateTime(Convert.ToInt32(dateParts[2]), Convert.ToInt32(dateParts[1]), Convert.ToInt32(dateParts[0]));
return true;
}
catch
{
return false;
}
}

private void InsertData()
{
for (int i = 0; i < Dt.Rows.Count; i++)
{
DataRow row = Dt.Rows[i];
int columnCount = Dt.Columns.Count;
string[] columns = new string[columnCount];
for (int j = 0; j < columnCount; j++)
{
columns[j] = row[j].ToString();
}
conn.Open();
string sql = "INSERT INTO EmpImport(EmployeeID,Name,Designation,DateOfBirth,City)";
sql += "VALUES('" + columns[0] + "','" + columns[1] + "','" + columns[2] + "',Convert(varchar(10),'" + columns[3] + "',103),'" + columns[4] + "')";
SqlCommand cmd = new SqlCommand(sql, conn);
cmd.ExecuteNonQuery();
conn.Close();
}
}

protected void btnIpload_Click(object sender, EventArgs e)
{
ImporttoDatatable();
InsertData();
BindGrid();
}

private void BindGrid()
{
DataSet ds = new DataSet();
conn.Open();
string cmdstr = "Select * from EmpImport";
SqlDataAdapter adp = new SqlDataAdapter(cmdstr, conn);
adp.Fill(ds);
empdet.DataSource = ds;
empdet.DataBind();
ds.Dispose();
conn.Close();
}
}
}