Datagridview & bindinglist exception

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C#

WinForms

DataGridView

I dont know how to adjustment question format..
I am working on WinForm application, there is some DataGridView using a BindingList as datasource.

MotionList = new List<motion>();
MotionBList = new BindingList<motion>(MotionList);
DataGridViewMotion.DataSource = MotionBList;
DataGridViewMotion.RowHeadersVisible = false;
DataGridViewMotion.AllowUserToAddRows = false;
DataGridViewMotion.AllowUserToResizeRows = false;
DataGridViewMotion.EnableHeadersVisualStyles = false;
DataGridViewMotion.ReadOnly = true;
for (int i = 0; i < dataGridViewMotion.Columns.Count; i++)
{
    dataGridViewMotion.Columns[i].SortMode = DataGridViewColumnSortMode.NotSortable;
}

Where

public class Motion
{
    public string StartPos { get; set; }
    public string EndPos { get; set; }
}

Then I use Method like MotionBList.Add() MotionBList.RemoveAt() to update DataGridViewMotion. It Works normally most of the time. methods was used them only this way, and executed only in UI Thread.

SyncContext = WindowsFormsSynchronizationContext.Current;

SyncContext.Post(new SendOrPostCallback((_) =>
{
    if (MotionBList.Count > 600)
    {
        for (int i = 0; i < 100; i++)
        {
             MotionBList.RemoveAt(0);
        }
    }
    MotionBList.Add(MakeMotion(...));
}), null);

private Motion MakeMotion(string a, string b)
{
    return new Motion() {StartPos = a, EndPos = b};
}

it has a small probability of exception in line MotionBList.Add(MakeMotion(...)), messages is as follows:

Application_ThreadException System.ArgumentOutOfRangeException The value of 107 is invalid for indexStart, indexStart must be less than or equal to 93. <br>
at System.Windows.Forms.DataGridViewRowCollection.GetPreviousRow(Int32 indexStart, DataGridViewElementStates includeFilter)<br>
at System.Windows.Forms.DataGridViewRowCollection.GetPreviousRow(Int32 indexStart, DataGridViewElementStates includeFilter, DataGridViewElementStates excludeFilter)<br>
at System.Windows.Forms.DataGridView.CorrectRowFrozenState(DataGridViewRow dataGridViewRow, DataGridViewElementStates rowState, Index32 anticiptedRowIndex)<br>
at System.Windows.Forms.DataGridView.OnInsertingRow(Int32 rowIndexInserted, DataGridViewRow dataGridViewRow, DataGridViewElementStates rowState, Point& newCurrentCell, Boolean firstInsertion, Int32 insertionCount, Boolean force)<br>
at System.Windows.Forms.DataGridViewRowCollection.InsertInternal(Int32 rowIndex, DataGridViewRow dataGridViewRow, Boolean force)<br>
at System.Windows.Forms.DataGridViewRowDataCollection.ProcessListChanged(ListChangedEventArgs e)<br>
at System.Windows.Forms.DataGridViewRowDataCollection.currencyManager_ListChanged(Object sender, ListChangedEventArgs e)<br>
at System.Windows.Forms.CurrencyManager.OnListChanged(ListChangedEventArgs e)<br>
at System.Windows.Forms.CurrencyManager.List_ListChanged(Object sender, ListChangedEventArgs e)<br>
at System.ComponentModel.BindingList~1.OnListChanged(ListChangedEventArgs e)<br>
at System.ComponentModel.BindingList~1.FireListChanged(ListChangedType type, Int32 index)<br>
at System.ComponentModel.BindingList~1.InsertItem(Int32 index, T item)<br>
at System.Collections.ObjectModel.Collection~1.Add(T item)<br>
at MotionBList.Add(MakeMotion(...))

And red cross appears on many other controls, Above exception was catched by code in Programe.cs

Application.ThreadException += Application_ThreadException;
private static void Application_ThreadException(object sender, ThreadExceptionEventArgs e)
{
   MessageBox.Show($"Application_ThreadException {e.Exception}");
}

What I have tried:

I have replaced MotionBList.Add(MakeMotion(...)) with var temp = MotionBList.AddNew(); MotionBList[MotionBList.IndexOf(temp)] = MakeMotion(...);