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If no text is selected in the control, this property indicates the insertion point for new text. If you set this property to a location beyond the length of the text in the control, the selection start position is placed after the last character. When text is selected in the text box control, changing this property can release the value of the ComboBox.SelectionLength property. If the remaining text in the control after the position indicated by the ComboBox.SelectionStart property is less than the value of the ComboBox.SelectionLength property, the value of the ComboBox.SelectionLength property is automatically decreased. The value of the ComboBox.SelectionStart property never causes an increase in the ComboBox.SelectionLength property.
ComboBox.SelectionStart returns the lower value of the current selection. For example, Select(10, -4) selects the text from character position 6 through character position 10. If you now get the ComboBox.SelectionStart value, it will be 6 rather than 10.