CODEWITHSUNDEEP
c#winformsdatagridview
Alex Fulton
Alex Fulton

Reputation: 13

C# keep row selection after dataGridView refresh

I have a dataGridView in a WinForm that is bound to a SQL database table. I want to refresh the data every two seconds or so, but maintain any row selection the user has made. Therefore I have set up a timer and implemented some code during the tick event. The code works fine to refresh the data, but I am struggling to get row selection to persist. What is happening is that when the timer ticks a second time, all rows in the dataGridView become selected and every tick after that. I am not sure what is causing this since my code to select the rows is inside a foreach loop and an if statement that should block this from happening. Here is my code for this function:

private void dataRefreshTimer_Tick(object sender, EventArgs e)
    {
        string selRows = null;
        foreach (DataGridViewRow row in taskDataGrid.Rows)
        {
            if (row.Selected = true)
            {
                selRows += row.Cells[0].Value.ToString() + ",";
                Console.WriteLine(selRows);
            }
        }
        currenttasksTableAdapter.Fill(taskManagerDataSet.currenttasks);
        currenttasksBindingSource.ResetBindings(false);
        try
        {
            if (selRows != null)
            {
                foreach (DataGridViewRow row in taskDataGrid.Rows)
                {
                    if (selRows.Contains(row.Cells[0].Value.ToString() + ","))
                    {
                        row.Selected = true;
                    }
                }
            }
        } catch (Exception ex) { Console.WriteLine(ex); }

Can anyone tell me what I am missing that is causing all rows to become selected? Thanks for any advice!

Upvotes: 1

Views: 2745

Answers (1)

Ivan Stoev
Ivan Stoev

Reputation: 205849

Can anyone tell me what I am missing that is causing all rows to become selected?

if (row.Selected = true)

Here you actually are selecting each row (= is assignment operator). It should really be

if (row.Selected)

or

if (row.Selected == true)

Upvotes: 1

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