form element input type=file has input text box greyed out by default

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ASP.NET

form element input type=file has input text box greyed out by default
i cann't type, edit or paste in textbox,this is for ie8 and ie9 only

Is there any way to allow text to be entered into this box again?
is there any other method to post a file ,bçoz i need option to edit in my project
i used to link folders like this
K:\SP Files\SP-000501 - SP-001000\SP-000501 - SP-000600\SP-000507

if i browse using input type=file or file upload method it will stop at end of file
like this
K:\SP Files\SP-000501 - SP-001000\SP-000501 - SP-000600\SP-000507\written opinion 13.11.01.doc

so i need to delete written oipnion 13.11.01.doc

is there any other upload methods available

can any one help me please,

here is my coding,

<asp:Literal runat="server" id="DocLocationLabel" Text="E-Document Location">
														
            <td class="dfv" colspan="3" nowrap=""> 
            <input id="DocLoc"  type="file" style="width: 620px;"  runat="server" />
            <asp:TextBox runat="server" ID="DocLocation" Columns="50" MaxLength="50" CssClass="field_input" RichTextEditorType="ASP Multi-line" Height="0" Width="0" TextMode="MultiLine" >   
                                                        
		    <BaseClasses:TextBoxMaxLengthValidator  runat="server" id="DocLocationTextBoxMaxLengthValidator" ControlToValidate="DocLocation" ErrorMessage="<%# GetResourceValue("Val:ValueTooLong", "CaseMS").Replace("{FieldName}", "E-Document Location") %>">														</BaseClasses:TextBoxMaxLengthValidator><br /><asp:Literal runat="server" id="LblDocLocation">
            
</td>

If Me.DocLoc.PostedFile.FileName.Length <> 0 Then
                Me.DocLocation.Text = System.IO.Path.GetFullPath(Me.DocLoc.PostedFile.FileName)
End If