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insert into Table1(field1) values(@field1)Dim obj As Object
If IsDate(TextBox1.Text) Then
obj = DateTime.Parse(Text1.Text)
Else
obj = DbNull.Value
End If
' 将插入语句的参数值填充为 obj
Dim sql As String = "insert into Table1(field1) values(@field1)[/"
Dim cmd As New SqlCommand(sql, connectionString)
cmd.Parameters.Add("@field1", SqlDBType.DateTime).Value = obj
cmd.ExecuteNonQuery