SqlBulkCopy无法访问表

在读取excel表（到transferTable）后，我想使用SqlBulkCopy将该数据添加到新表（destinationTable）中，但我得到了错误：

Cannot access destination table 'test'

我尝试过使用默认的表名和方括号，但没有成功。

有什么建议吗？

private void writeToDBButton_Click(object sender, EventArgs e) {
    MakeTable();
    destinationTable.TableName = "test";
    testDBDataSet.Tables.Add("test");
    // Connects to the sql-server using Connection.cs
    SqlConnection connection = Connection.GetConnection();
    using (connection) {
        connection.Open();
        // Uses SqlBulkCopy to copy the data from our transferTable to the destinationTable
        using (SqlBulkCopy bulkCopy = new SqlBulkCopy(connection)) {
            bulkCopy.DestinationTableName = destinationTable.TableName;
            try {
                // Write from the source to the destination.
                bulkCopy.WriteToServer(transferTable);
                this.dataGridView2.DataSource = destinationTable;
            }
            catch (Exception ex) {
                MessageBox.Show(ex.Message);
            }
            connection.Close();
        }
    }
}
private void saveDBButton_Click(object sender, EventArgs e) {
    this.Validate();
    this.usersBindingSource.EndEdit();
    this.tableAdapterManager.UpdateAll(this.testDBDataSet);
}

private void MakeTable() {
    for (int counter = 0; counter < columns; counter++) {
        DataColumn dummy = new DataColumn();
        dummy.DataType = System.Type.GetType("System.Double");
        destinationTable.Columns.Add(dummy);
    }
}