Manipulate datatables in a dataset

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C#

DataTable

dataset

I have two tables in a dataset and based on one table values i have to modify another table value and display it in the view

but the thing is Recommendations column is not available in DiagnosisFaultDescription1 it is in RecommendationDetails how can i change that row value?? Unfortunately there is no relation between 2 tables.

DataTable dt = _dsexportData.Tables["DiagnosisFaultDescription1"];
DataTable dt1 = _dsexportData.Tables["RecommendationDetails"];

foreach (DataRow item in dt.Rows)
{
    if (item[0].ToString() == "Non-standard Fault Detected" && item[1].ToString() == "Moderate")
    {
        //how to change other table values here??

    }

}

Fault description Fault severity
Pump Imbalance Serious
Non-standard Fault Detected Moderate


Recommendations
Balance the pump
Contact Vibration specialist


for Non-standard Fault Detectedand modearate severity i have to show Contact viration specialist and for anyother combination i have to show blank.