Datatable to insert update Adonet

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ASP.NET

ADO.NET

C#5.0

i have a data table input using sql adapater how to insert update delete event in asp.net c#

my code is as follows.

public static void BatchUpdate(DataTable dataTable)
       {
           string connectionString = "My connections string"



           //// Assumes GetConnectionString() returns a valid connection string.


           // Connect to the AdventureWorks database.
           using (SqlConnection connection = new
             SqlConnection(connectionString))
           {

               // Create a SqlDataAdapter.
               SqlDataAdapter adapter = new SqlDataAdapter();
               adapter.MissingSchemaAction = MissingSchemaAction.AddWithKey;

               //// Create the commands.
               adapter.SelectCommand = new SqlCommand(
                   "SELECT EmpolyeeKey,EffectiveDate,EmpolyeeAllowanceDeduction FROM [dbo].[EmployeeAllwDedDetail]", connection);
               adapter.Fill(dataTable);
               adapter.InsertCommand = new SqlCommand(
                   "INSERT INTO EmployeeAllwDedDetail (EmpolyeeKey, EffectiveDate,EmpolyeeAllowanceDeduction,CreatedDate) " +
                   "VALUES (@EmpolyeeKey, @EffectiveDate,@EmpolyeeAllowanceDeduction,@CreatedDate)", connection);

               adapter.UpdateCommand = new SqlCommand(
      "UPDATE Customers SET EmpolyeeAllowanceDeduction = @EmpolyeeAllowanceDeduction, ModifiedDate = @ModifiedDate " +
      "WHERE EmpolyeeKey = @EmpolyeeKey", connection);

               // Create the parameters.
               adapter.InsertCommand.Parameters.Add("@EmpolyeeKey",
                   SqlDbType.BigInt, 1000, "EmpolyeeKey");

               adapter.InsertCommand.Parameters.Add("@EffectiveDate",
                   SqlDbType.DateTime, 40, "EffectiveDate");

               adapter.InsertCommand.Parameters.Add("@EmpolyeeAllowanceDeduction",
                    SqlDbType.Xml, 100000, "EmpolyeeAllowanceDeduction");

               adapter.InsertCommand.Parameters.Add("@EmpolyeeKey",
      SqlDbType.DateTime, 40, "EmpolyeeKey");


               adapter.UpdateCommand.Parameters.Add("@EmpolyeeAllowanceDeduction",
                   SqlDbType.VarChar, 40, "EmpolyeeAllowanceDeduction");
               adapter.UpdateCommand.Parameters.Add("@ModifiedDate",
                   SqlDbType.Char, 5, "ModifiedDate").SourceVersion =
                   DataRowVersion.Original;


               // Execute the update.
               int i= adapter.Update(dataTable);


           }

Unable to insert update events.