ExecuteNonQuery: CommandText property has not been initialized

Dim conn As New SqlConnection(GetConnectionString())
                Dim sb As New StringBuilder(String.Empty)
        
                Dim splitItems As String() = Nothing
                For Each item As String In sc
        
                    Const sqlStatement As String = "INSERT INTO Date (dateID,date) VALUES"
                    If item.Contains(",") Then
                        splitItems = item.Split(",".ToCharArray())
                        sb.AppendFormat("{0}('{1}'); ", sqlStatement, splitItems(0))
        
                    End If
                Next
        
                Try
                    conn.Open()
                    Dim cmd As New SqlCommand(sb.ToString(), conn)
                   
                    cmd.CommandType = CommandType.Text
                    cmd.ExecuteNonQuery()
        
        
                    Page.ClientScript.RegisterClientScriptBlock(GetType(Page), "Script", "alert('Records Successfuly Saved!');", True)
                Catch ex As System.Data.SqlClient.SqlException
                    Dim msg As String = "Insert Error:"
                    msg += ex.Message
        
                    Throw New Exception(msg)
                Finally
                    conn.Close()
                End Try

Dim conn As New SqlConnection(GetConnectionString())
        Dim sb As New StringBuilder(String.Empty)

        Dim splitItems As String() = Nothing
        For Each item As String In sc

            Const sqlStatement As String = "INSERT INTO GuestList (groupID,guest,contact,eEmail,relationship,info,customerID) VALUES"
            If item.Contains(",") Then
                splitItems = item.Split(",".ToCharArray())
                sb.AppendFormat("{0}('{1}','{2}','{3}','{4}','{5}','{6}','{7}'); ", sqlStatement, splitItems(0), splitItems(1), splitItems(2), splitItems(3), splitItems(4), splitItems(5), Session("customerID"))

            End If
        Next

        Try
            conn.Open()
            Dim cmd As New SqlCommand(sb.ToString(), conn)
            cmd.CommandType = CommandType.Text
            cmd.ExecuteNonQuery()


            Page.ClientScript.RegisterClientScriptBlock(GetType(Page), "Script", "alert('Records Successfuly Saved!');", True)
        Catch ex As System.Data.SqlClient.SqlException
            Dim msg As String = "Insert Error:"
            msg += ex.Message

            Throw New Exception(msg)
        Finally
            conn.Close()
        End Try