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string sql = "update leadspeak set images=@images,content=@content,author=@author,title=@title where id=@id";
  OleDbParameter[] para = new OleDbParameter[]{
  new OleDbParameter("@id",leadSpeak.Id),
  new OleDbParameter("@images",leadSpeak.Images),
  new OleDbParameter("@content",leadSpeak.Content),
  new OleDbParameter("@author",leadSpeak.Author),
  new OleDbParameter("@title",leadSpeak.Title)
  };
 int num= DBHelper.ExecuteNonQuery(sql, CommandType.Text, para);

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C# code:
string sql = "update leadspeak set images=?,content=?,author=?,title=? where id=?";
OleDbParameter[] para = new OleDbParameter[]{
new OleDbParameter("?",leadSpeak.Id),
new OleDbParameter("?",leadSpeak.Images),
new OleDbParameter("?",leadSpeak.Content),
new OleDbParameter("?",leadSpeak.Author),
new OleDbParameter("?",leadSpeak.Title)
};
int num= DBHelper.ExecuteNonQuery(sql, CommandType.Text, para);

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