how to assign string variable to datable?

I h开发者_高级运维ave to assign string variable to datatable. dtHistoryList.Rows[1].ItemArray[3] = txtNaiyo.Text; It doesn't work. Please Help me.

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Use the indexer

dtHistoryList.Rows[1][3] = txtNaiyo.Text

or

dtHistoryList.Rows[1]["rowName"] = txtNaiyo.Text