DataSet - RowChanged Event raised many Times?

I have this code :

this.hRAddNewDataSet.Employee.RowChanged += new DataRowChangeEventHandler(Employee_RowChanged);

    void Employee_RowChanged(object sender, DataRowChangeEventArgs e)
    {
        test++;
        Trace.WriteLine(test.ToString());
    }

When I run my app and edit one row and then click the save button, the RowChanged event will fire 35 time!. I know this because of the value for test var.

My Questions:

开发者_JAVA技巧

1. why this event fire like this?
2. How I can get the current column is being updated?

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why this event fire like this?

Perhaps you are wiring up the event handler multiple times?

Or maybe some part of your code is changing the row multiple times?

How I can get the current column is being updated?

Use the ColumnChanged event and check the DataColumnChangeEventArgs parameter.