I need to access a file on a network share from an ASP.NET application
(using methods like file.readalltext). Of course ASP.NET doesn't have access
to that share. But I do have both UserID and password of a user who does
have access. How do I use them to supply credentials for  file.readalltext
method (similar how I can do that for WebClient with NetworkCredentials)?

Thanks!

Yuriy.

Quickest way is impersonation with asp.net.

Inside of

<system.web>

  <authentication mode="Windows" />
  <identity impersonate="true" userName="mycompany\myname" password="mypwd"
/>

 </system.web>

That should give you something to search on.

#region WIN API Declarations

//used in calling WNetAddConnection2

[StructLayout(LayoutKind.Sequential)]

public struct NETRESOURCE

{

public int dwScope;

public int dwType;

public int dwDisplayType;

public int dwUsage;

[MarshalAs(UnmanagedType.LPStr)]

public string lpLocalName;

[MarshalAs(UnmanagedType.LPStr)]

public string lpRemoteName;

[MarshalAs(UnmanagedType.LPStr)]

public string lpComment;

[MarshalAs(UnmanagedType.LPStr)]

public string lpProvider;

[DllImport("mpr.dll",

CharSet = System.Runtime.InteropServices.CharSet.Auto)]

private static extern int WNetAddConnection2A(

[MarshalAs(UnmanagedType.LPArray)] NETRESOURCE[] lpNetResource,

[MarshalAs(UnmanagedType.LPStr)] string lpPassword,

[MarshalAs(UnmanagedType.LPStr)] string lpUserName,

int dwFlags);

[DllImport("mpr.dll",

CharSet = System.Runtime.InteropServices.CharSet.Auto)]

private static extern int WNetCancelConnection2A(

[MarshalAs(UnmanagedType.LPStr)] string lpName,

int dwFlags, int fForce);

#endregion

private byte[] GetFSMSFile(string sFile)

{

NETRESOURCE[] nr = new NETRESOURCE[1];

nr[0].lpRemoteName = _sFSMSShare;

nr[0].lpLocalName = ""; //mLocalName;

nr[0].dwType = 1; //disk

nr[0].dwDisplayType = 0;

nr[0].dwScope = 0;

nr[0].dwUsage = 0;

nr[0].lpComment = "";

nr[0].lpProvider = "";

int iErr = WNetAddConnection2A(nr, _sFSMSShareUserPassword, _sFSMSShareUser,
0);

if (iErr > 0)

throw new Exception("Can not connect to FSMS share folder");

FileStream st = null;

try

{

st = new FileStream(_sFSMSShare + "\\" + sFile, FileMode.Open);

int iLen = (int)st.Length;

byte []b = new byte[iLen];

st.Read(b, 0, iLen);

return b;

{

if( st != null )

st.Close();

WNetCancelConnection2A(_sFSMSShare, 0, -1);

Yuriy.