Need help with ODBC parameters in and Datagrid

I have in issue in that I need help with. My Datagrid is using an ODBC connection to a Sybase DB and my query has 4 parameters, two of which are in a LIKE clause:
	AND (vhs.SALESDATE >= ? AND vhs.SALESDATE <= ?) 
	AND (vhs.MAKE LIKE ?) AND (vhs.Model LIKE ?)"

    <asp:ControlParameter Name="FromDate" 
      Type="DateTime" PropertyName="SelectedDate"/>
    <asp:ControlParameter Name="ToDate" 
      Type="DateTime" PropertyName="SelectedDate"/>
    <asp:ControlParameter Name="Make" 
      Type="string" PropertyName="Text"/>
    <asp:ControlParameter Name="Model" 
      Type="string" PropertyName="Text"/>

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I cant figure out how to pass the text variables in the query by appending for example '%" + rtMake + "%'  or similar to make the LIKE function work correctly. Everything I do results in a "Server Tag not Well Formed".

Any ideas? Thanks in advance
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You can use the SqlDataSource.Selecting event to change the value of the parameters.

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hhnetworksAuthor Commented:
Thanks Louis! That worked. For anyone else needing a code behind sample it is here:

protected void DATASOURCE_Selecting(object sender, SqlDataSourceSelectingEventArgs e)
            e.Command.Parameters[2].Value = "%" + rtMake.Text + "%";
            e.Command.Parameters[3].Value = "%" + rtModel.Text + "%";

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