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asp.net foreachÑ­»·datatable

HTML code:
foreach (DataRow dataRow in _dataTable)
{
dataRow.Table.Columns["AutoID"].ToString();
}


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foreach (DataRow dataRow in _dataTable.Rows)
{
    dataRow["AutoID"].ToString();
}

string tmp;
foreach (DataRow dataRow in _dataTable.Rows)
{
    tmp = dataRow["AutoID"].ToString();
}

foreach (DataRow dataRow in _dataTable)
{
    dataRow["AutoID"].ToString();
}



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