教：如何取消DataGridView的修改？
我在DataGridView中某cell值修改後，一段程式做料查，如有不合理的取消修改，更至修改前的值，教如何做？
祝年!

[解决办法]
在数据库放个预修改字段？
[解决办法]
MARK
[解决办法]
将datagridview的CauseValidation属性设置为True，然后你可以在CellValidating或DataError事件中编制代码来检查输入的值是否正确。下面是实例代码：
private void dataGridView1_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
{
int newInteger;
dataGridView1.Rows[e.RowIndex].ErrorText = " ";
if ((dataGridView1.Columns[e.ColumnIndex].DataPropertyName == "UnitsInStock ") ||
(dataGridView1.Columns[e.ColumnIndex].DataPropertyName == "UnitsOnOrder ") ||
(dataGridView1.Columns[e.ColumnIndex].DataPropertyName == "ReorderLevel "))
{
if (!int.TryParse(e.FormattedValue.ToString(), out newInteger) || newInteger < 0)
{
dataGridView1.Rows[e.RowIndex].ErrorText =
"Value must be a non-negative number ";
e.Cancel = true;
}
}
}

private void dataGridView1_CellEndEdit(object sender, DataGridViewCellEventArgs e)
{
dataGridView1.Rows[e.RowIndex].ErrorText = " ";
}

private void dataGridView1_DataError(object sender, DataGridViewDataErrorEventArgs e)
{
dataGridView1.Rows[e.RowIndex].ErrorText = "Invalid input. Please re-enter ";
e.Cancel = true;
}