Exhibit 31.1Certifications

 
| I, W.  Jennings Duncan, President and Chief Executive Officer, certify that:    |
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| 1.                                                                                   | I have reviewed this quarterly report on Form 10-Q of CNB Corporation;    |
| 2.                                                                                   | Based on my knowledge, this report does not contain any untrue  statement of a material fact or omit to state a material fact necessary to  make the statements made, in light of the circumstances under which such  statements were made, not misleading with respect to the period covered by  this report; |
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| 3.                                                                                   | Based on my knowledge, the financial statements, and other  financial information included in this report, fairly present in all material  respects the financial condition, results of operations and cash flows of the  registrant as of, and for, the periods presented in this report; |
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| 4.                                                                                   | The registrant's other certifying officer and I are  responsible for establishing and maintaining disclosure controls and  procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and  internal control over financial reporting (as defined in Exchange Act Rules  13a-15(f) and 15d-15(f)) for the registrant and have: |
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|                                                                                 | (a)     Designed  such disclosure controls and procedures, or caused such disclosure controls  and procedures to be designed under           our supervision, to ensure that material  information relating to the registrant, including its consolidated  subsidiaries, is made           known to us by others within those entities,  particularly during the period in which this report is being prepared; |
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|                                                                                 | (b)     Designed  such internal control over financial reporting, or caused such internal  control over financial reporting to be           designed under our supervision, to  provide reasonable assurance regarding the reliability of financial reporting  and the           preparation of financial statements for external purposes in accordance  with generally accepted accounting principles; |
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|                                                                                 | (c)     Evaluated  the effectiveness of the registrant's disclosure controls and procedures and  presented in this report our           conclusions about the effectiveness of the  disclosure controls and procedures, as of the end of the period covered by  this           report based on such evaluation; and |
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|                                                                                 | (d)     Disclosed  in this report any change in the registrant's internal control over financial  reporting that occurred during the           registrant's most recent fiscal quarter  (the registrant's fourth fiscal quarter in the case of an annual report) that  has materially           affected, or is reasonably likely to materially affect, the  registrant's internal control over financial reporting; and |
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| 5.                                                                                   | The  registrant's other certifying officer and I have disclosed, based on our most  recent evaluation of internal control over financial reporting, to the  registrant's auditors and the audit committee of the registrant's board of  directors (or persons performing the equivalent functions): |
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|                                                                                 | (a)     All  significant deficiencies and material weaknesses in the design or operation  of internal control over financial reporting           which are reasonably likely to  adversely affect the registrant's ability to record, process, summarize and  report financial           information; and |
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|                                                                                 | (b)    Any  fraud, whether or not material, that involves management or other employees  who have a significant role in the           registrant's internal control over  financial reporting. |
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| Date:   May 9, 2008                                                             | /s/W. Jennings Duncan                                                            W. Jennings  Duncan  President and Chief Executive Officer |
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