A Null value that appear

Help
1

Hello guys,

I’m coding a c# code where i’m reading in datatable:

foreach (DataRow row in dtexcel.Rows)
{

                    if (row[0]== DBNull.Value)
                    {
                        labname = string.Empty;
                        Console.WriteLine("Empty");
                    }
                    else
                    {
                        if (item.Contains((string)row[0]))
                        {

                            labname = item;

                        }

                    }
                    

                    }

rw[0] is not emty in the excel file but when running the code it get a Null vale ???