Question

I need to write an sql query (in c#) to select excel sheet data in only the “C” column starting from C19. But i cant specify the ending cell number because more data are getting added to the column. Hence i need to know how to specify the end of the column. Please help. I have mentioned the query that i’m using. And I have attached an image of the excel sheet that i’m using!.And I have attached the output datagridview!

//Generte Oracle Datatable
            OleDbConnection conn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;"
            + @"Data Source=" + textBox1.Text + ";" + @"Extended Properties=""Excel 12.0 Macro;HDR=Yes""");
            conn.Open();

            OleDbCommand ccmd = new OleDbCommand(@"Select * From [SPAT$]", conn);
            OleDbDataAdapter adapter = new OleDbDataAdapter(ccmd);                     
            DataTable Oracle = new DataTable();
            adapter.Fill(Oracle);

            for (int y = 19; y < Oracle.Rows.Count; y++)
            {
                var value = Oracle.Rows[y][3].ToString();           
            }   
            dataGridView1.DataSource = Oracle.AsEnumerable().Where((row, index) => index > 3).CopyToDataTable();                

Answer 1

First Approach, using OLE Query:

OleDbCommand ccmd = new OleDbCommand(@"Select * From [SPAT$]", conn);
OleDbDataAdapter da = new OleDbDataAdapter(ccmd);
DataTable dt = new DataTable();
da.Fill(dt);

for (int i = 19; i < dt.Rows.Count; i++)
{
    var value = dt.Rows[i][3].ToString(); // here 3 refers to column 'C'
}

For criteria based DataTable

dataGridView1.DataSource = dt.AsEnumerable()
                          .Where((row, index) => index >= 19)
                          .CopyToDataTable();

For Column “C” only

dataGridView1.DataSource = dt.AsEnumerable()
                      .Where((row, index) => index >= 19)
                      .Select(t => t[3].ToString()).ToList();

Second Approach, using Excel COM object:

using Excel = Microsoft.Office.Interop.Excel;

Excel.Application xlApp = new Excel.Application();
Excel.Workbook xlWorkbook = xlApp.Workbooks.Open("path to book");
Excel.Worksheet xlSheet = xlWorkbook.Sheets[1]; // get first sheet
Excel.Range xlRange = xlSheet.UsedRange; // get the entire used range

int numberOfRows = xlRange.Rows.Count;

List<string> columnValue = new List<string>();
// loop over each column number and add results to the list

int c = 3; // Column 'C'
for(int r = 19; r <= numberOfRows; r++)
{
    if(xlRange.Cells[r,c].Value2 != null) // ADDED IN EDIT
    {
        columnValue.Add(xlRange.Cells[r,c].Value2.ToString());
    }
}