OleDbConnection con = new OleDbConnection("ConnectionString");
OleDbCommand cmd = new OleDbCommand("Insert into table where ImageName=@imgName and ImageData=@imgData");
cmd.Parameters.Add("@imgName");
cmd.Parameters.Add("@imgData");
cmd.Parameters["@imgName"] = FileUpload1.FileName;
cmd.Parameters["@imgData"] = FileUpload1.FileBytes;
cmd.ExecuteNonQuery();