How to check particular table in datatable in c#

Question

Suppose I have values in the dataset, I have to use it using the data table and I have to check and apply the condition in table1 of the dataset using a data table.

private void generateResult_paid(DataTable dt, IXLWorksheet worksheet, string sheetname)
{
    if(table1  of dataset)
        lineNum = 11;
    else
        lineNum = 1;
}

I have to used value in the data table, not in the data set.

 

How I get table1 of the dataset using a data table.