title: How to get the values from a column in Excel in uppercase after putting them into a DataTable
body: <p>I am trying to get the values from column 18, Test to uppercase after the upload of the excel file but without any succes.</p>
  
  <p><img src="https://i.stack.imgur.com/xUtPN.png" alt="enter image description here"></p>
  
  <p>How exactly can I reach the values that are in a DataTable?</p>
  
  <p>This is where I fill the DataTable with the values from the excel file:</p>
  
  <pre><code> using (OleDbDataAdapter adapter = new OleDbDataAdapter(command))
          {
              DataTable dataTable = new DataTable();
              adapter.Fill(dataTable);
              return dataTable;
          }
  </code></pre>
  
  <p>I would like to have all the values in 18 to be uppercase.</p>