ADO.NET :: Insert ID Which ID Is Auto - Increase In Table Of Database?

How to insert a auto increase in table of database? table TechCode consist TechCodeID and TechCodeDesc These following are my code

Protected Sub btnAdd_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnAdd.Click
Dim strTechCode As String
strTechCode = tbAdd.Text
Dim sqlCon As New SqlConnection
sqlCon = db.getConnection()
If sqlCon.State = ConnectionState.Closed Then
sqlCon.Open()
End If
Using sqlCmd As SqlCommand = sqlCon.CreateCommand()
sqlCmd.CommandText = "InsertTechCode"
sqlCmd.CommandType = CommandType.StoredProcedure
'TechCodeID is the auto increase ID in database
sqlCmd.Parameters.AddWithValue("@TechCodeID", Decimal.Parse("TechCodeID"))
sqlCmd.Parameters.AddWithValue("@TechCodeDesc", strTechCode)
sqlCmd.ExecuteNonQuery()
If sqlCon.State = ConnectionState.Open Then
sqlCon.Close()
End If
End Using
End Sub