我想要透過DropDownList切換的時候下方的Gridview來顯示資料
然後用Gridview裡的按鈕來修改資料
但是不知道為何我按修改按鈕要按兩次才會有作用


然後這是我的語法

    protected void DDL_data_SelectedIndexChanged(object sender, EventArgs e)
    {
        string sql = "SELECT * FROM "+DDL_data.Text+"";
        SQLDB db = new SQLDB();
        DataTable dt = db.GetDataTable(sql, CommandType.Text);
        GV1.DataSource = dt;
        GV1.DataBind();
    }

protected void DDL_data_DataBound(object sender, EventArgs e)
    {
        string sql = "SELECT * FROM " + DDL_data.Text + "";
        SQLDB db = new SQLDB();
        DataTable dt = db.GetDataTable(sql, CommandType.Text);
        GV1.DataSource = dt;
        GV1.DataBind();

    }

    protected void GV1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        string sql = "SELECT * FROM " + DDL_data.Text + "";
        SQLDB db = new SQLDB();
        DataTable dt = db.GetDataTable(sql, CommandType.Text);
        GV1.DataSource = dt;
        GV1.DataBind();
    }