how to create dynamic check boxes for X and Y axis

This code will create CheckBox for each column from list and add it to FlowLayoutPanel:

var columns = new List<string>() { "First column", "Second column", "Third column" };
foreach (var column in columns)
{
    var checkBox = new CheckBox();
    checkBox.Text = column;
    checkBox.Checked = false;
    flowLayoutPanel1.Controls.Add(checkBox);
}

This part will return list of checked columns names:

var checkedColumns = new List<string>();
foreach (CheckBox checkBox in flowLayoutPanel1.Controls)
{
    if (checkBox.Checked)
    {
        checkedColumns.Add(checkBox.Text);
    }
}

Another solution is to use CheckedListBox component.
Add columns to checkedBoxList:

var columns = new List<string>() { "First column", "Second column", "Third column" };
foreach (var column in columns)
{
    checkedListBox1.Items.Add(column);
}

Retrieve checked column names:

var checkedColumns = new List<string>();
foreach (string item in checkedListBox1.CheckedItems)
{
    checkedColumns.Add(item);
}

Hope I helped you.