请教怎么控制GridView内的编辑框的大小


    <asp:GridView ID="gvResource" runat="server" AutoGenerateColumns="False" AllowPaging="True"
        OnPageIndexChanging="gvResource_PageIndexChanging" OnRowCancelingEdit="gvResource_RowCancelingEdit"
        OnRowEditing="gvResource_RowEditing" OnRowUpdating="gvResource_RowUpdating" OnRowDeleting="gvResource_RowDeleting">
        <Columns>
.......
            <asp:TemplateField HeaderText="Content" >
                <EditItemTemplate>
                    <asp:TextBox ID="tbTranscontent" runat="server" Text='<%# Bind("transcontent") %>' TextMode="MultiLine" Columns="100" Rows="3" ></asp:TextBox>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="lblTranscontent" runat="server" Text='<%#Server.HtmlEncode(Eval("transcontent").ToString()) %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:CommandField HeaderText="Edit " ShowEditButton="True" EditText="Edit" UpdateText="Update"
                CancelText="Cancel">
                <ItemStyle Width="5%" />
            </asp:CommandField>
......
        </Columns>
    </asp:GridView>如上图及代码请教，怎么样让输入框的大小能随着内容的多少自动改变高度，不要有滚动条
或者，可以用鼠标调输入框的大小？