How can I cancel clickevent when sorting datagrid

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C#

sorting

DataGrid

when clicking on columnheader for sorting the grid also the clickevent is raised.
within the clickevent I do several things with the current row (mark/unmark) -
so when I want to sort the grid, my mark will also be set - how can I cancel this ?
Is it possible to readout wether I clicked within the grid or on columnheader ?

private void dataGridView1_Click(object sender, EventArgs e)
{
    if (dataGridView1.CurrentRow is null) return;
    Log("dataGridView1_Click" + dataGridView1.CurrentRow.Index.ToString());
    bool myBool;
    myBool = !(bool)dataGridView1.Rows[dataGridView1.CurrentRow.Index].Cells["X"].Value; // invertieren !
    dataGridView1.Rows[dataGridView1.CurrentRow.Index].Cells["X"].Value = myBool;
    myColumnDict[dataGridView1.Rows[dataGridView1.CurrentRow.Index].Cells["COLUMN_NAME"].Value.ToString()] = myBool;
}

What I have tried:

log the sequence of the raised event when clicking column-header:
1. datagrid.click
2. datagrid.sorted