VB.NET校验字符串是否是日期

'Validate for a date Shared Function checkdate(ByVal thisvalue As String) As String If Not IsDate(thisvalue) Then checkdate = "NULL" Else checkdate = "'" & thisvalue & "'" End If Return checkdate End Function ' END checkdate

VB.NET检查字符串是否是数字

'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 'Used to submit values to the database, check for empty value, replace w/ "NULL" '~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Shared Function checkNumber(ByVal thisvalue As String) As String If IsDBNull(thisvalue) Or Len(thisvalue) = 0 Or Not IsNumeric(thisvalue) Then checkNumber = "NULL" Else checkNumber = thisvalue End If Return checkNumber End Function ' END checkNumber

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