how to delete data from Access using c sharp

See more:

C#2.0

C#

I hava written a code but this code does not working.
Please help me............
The code is like this.................

string str = cmbProjctId.Text;
OleDbCommand cmd = new OleDbCommand("Delete Proj_dtls WHERE projectId=@id", con);
 cmd.Parameters.Add(new OleDbParameter("@id",str)); 

con.Open();
cmd.ExecuteNonQuery();