Adding Records in SQL Server Express 2005

When adding records containing a date field in SQL Server 2005 Express I get an errorInput string was not in a correct format. Do datefields have to be converted when adding or editing into strings?

I usually insert dates into SQL in String format. SQL can convert them by himself. BUT at least in our environment you have to create the date string in "MM.DD.YYYY" format so if you are trying "DD.MM.YYYY" It propably wont work though I know this could be solved with localization somewhere, somehow :)
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I do have it in string format. Any Ideas? My code excerpt

<asp:SqlDataSourceID="SqlDataSource2"runat="server"ConnectionString="<%$ ConnectionStrings:Web2005ConnectionString1 %>"

ProviderName="<%$ ConnectionStrings:Web2005ConnectionString1.ProviderName %>"

SelectCommand="SELECT * FROM [People] WHERE ([id] = @.id)"

InsertCommand="INSERT INTO [People] ([LastName], [FirstName], [Price], [LogDate]) VALUES (@.LastName, @.FirstName, @.Price, @.LogDate)"UpdateCommand="UPDATE [People] SET [LastName] = @.LastName, [FirstName] = @.FirstName, [Price] = @.Price, [LogDate] = @.LogDate WHERE [id] = @.id"DeleteCommand="DELETE FROM [People] WHERE [id] = @.id">

<SelectParameters>

<asp:ControlParameterControlID="GridView1"Name="id"PropertyName="SelectedValue"

Type="Int64"/>

</SelectParameters>

<UpdateParameters>

<asp:ParameterName="LastName"Type="String"/>

<asp:ParameterName="FirstName"Type="String"/>

<asp:ParameterName="Price"Type="Decimal"/>

<asp:ParameterName="LogDate"Type="DateTime"/>

<asp:ParameterName="id"Type="Int64"/>

</UpdateParameters>

<InsertParameters>

<asp:ParameterName="LastName"Type="String"/>

<asp:ParameterName="FirstName"Type="String"/>

<asp:ParameterName="Price"Type="Decimal"/>

<asp:ParameterName="LogDate"Type="DateTime"/>

</InsertParameters>