Question

UPDATE 2

string connectionString = String.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=""Excel 8.0;HDR=YES;IMEX=1;""", EXCELFILENAME);

            string testCaseName = "test_case_2";

            string query = String.Format("SELECT * from [{0}$] WHERE columns={1}", workbookName, testCaseName);

            OleDbDataAdapter dataAdapter = new OleDbDataAdapter(query, connectionString);

            DataSet dataSet = new DataSet();
            dataAdapter.Fill(dataSet); //<<ERROR 

        DataTable myTable = dataSet.Tables[0]; 

ERROR:
No value given for one or more required parameters.

UPDATE END

UPDATE:

string connectionString = String.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=""Excel 8.0;HDR=YES;IMEX=1;""", EXCELFILENAME);
            string query = String.Format("select * from [{0}$]", workbookName);

            OleDbDataAdapter dataAdapter = new OleDbDataAdapter(query, connectionString);               
            DataSet dataSet = new DataSet();
            dataAdapter.Fill(dataSet);

            DataTable myTable = dataSet.Tables[0];

How to read data from cells and store it in array/string. I have done reading worksheet but can’t find any better of doing

so here is my excel sheet looks like:

I should be able to pass the column in my case test_case_1 or test_case_2 etc… and read the columns for that particular row….

Answer 1

Regarding filtering.

As you are using OleDb for your data retrieval, nothing prevents you from using more advanced SQL:

string testCaseName = "Test_case_1
string query = String.Format("SELECT * from [{0}$] WHERE columns=\"{1}\"", workbookName, testCaseName);

You can use the names of the columns for filtering. In your case the filter is on the columns field. (btw. it is a confusing name)

As far as I remember the header of the table must be in the first row, you may need to move your table one row up.