Question

string connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + Application.StartupPath + "\\a.xlsx" + ";Extended Properties='Excel 12.0 Xml;HDR=No'";
        OleDbConnection conn = new OleDbConnection(connString);
        OleDbCommand cmd = new OleDbCommand("Update [tablenameeee$] SET A1='15'", conn);
        conn.Open();
        cmd.ExecuteNonQuery();
        conn.Close();

i want to access a specific cell in excel , and change its value . but i got the exception

OleDbException. No value given for one or more required parameters.What is the solution ?

Answer 1

If you use HDR=NO the column names are F1, F2 F3 etc……

OleDbCommand cmd = new OleDbCommand("Update [tablenameeee$] SET F1='15'", conn); 

but I think you should specify a WHERE clause to delimit the affected rows.
Remeber, using OleDb you should not think in terms of Rows/Columns but in terms of Records.

As an alternative, if you know exactly the row/column to update you could use

OleDbCommand cmd = new OleDbCommand("Update [tablenameeee$A1:A1] SET F1='15'", conn);