cannot convert from 'string' to 'ref string'

[kishor]

I have an activeX dll, I am calling one function from that
dll. I am using C# as coding language. I am getting
following error.
cannot convert from 'string' to 'ref string'
How do I call this function ?.

My statement is like this
CustomOutVal = CustObj.Authenticate(txtUserName.Text,
pass , Domain );

Regards,
Kishor

[Ansil MCAD]

hi
try passing the strings as ref to the function

check this article
http://www.codeproject.com/dotnet/cominterop.asp

regards
ansil

"kishor" wrote:

I have an activeX dll, I am calling one function from that
dll. I am using C# as coding language. I am getting
following error.
cannot convert from 'string' to 'ref string'
How do I call this function ?.

My statement is like this
CustomOutVal = CustObj.Authenticate(txtUserName.Text,
pass , Domain );

Regards,
Kishor

[Jon Skeet [C# MVP]]

kishor <ki****@discussions.microsoft.com> wrote:

I have an activeX dll, I am calling one function from that
dll. I am using C# as coding language. I am getting
following error.
cannot convert from 'string' to 'ref string'
How do I call this function ?.

By specifiying the parameter as "ref" as well.

See http://www.pobox.com/~skeet/csharp/parameters.html

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[Eddie de Bear]

Which of the parameters is supposed to be passed by ref?? If it is the first
parameter (txtUserName.Text) then you will need to create another string
variable, set it = to txtUserName.text and pass that into the call. The
reason for this is that properties cannot be used as reference parameters..

To top this off, when calling a method that has a ref parameter, specify the
ref keyword..

an example would be (if the first parameter is the ref parameter):
string tempUserName = txtUserName.Text;
CustomOutVal = CustObj.Authenticate(ref tmpUserName,
pass , Domain );

Hope this helps

Eddie de Bear

"kishor" wrote:

I have an activeX dll, I am calling one function from that
dll. I am using C# as coding language. I am getting
following error.
cannot convert from 'string' to 'ref string'
How do I call this function ?.

My statement is like this
CustomOutVal = CustObj.Authenticate(txtUserName.Text,
pass , Domain );

Regards,
Kishor

[kishor]

Thanks,
problem solved

Kishor

"Eddie de Bear" wrote:

Which of the parameters is supposed to be passed by ref?? If it is the first
parameter (txtUserName.Text) then you will need to create another string
variable, set it = to txtUserName.text and pass that into the call. The
reason for this is that properties cannot be used as reference parameters..

To top this off, when calling a method that has a ref parameter, specify the
ref keyword..

an example would be (if the first parameter is the ref parameter):
string tempUserName = txtUserName.Text;
CustomOutVal = CustObj.Authenticate(ref tmpUserName,
pass , Domain );

Hope this helps

Eddie de Bear

"kishor" wrote:

I have an activeX dll, I am calling one function from that
dll. I am using C# as coding language. I am getting
following error.
cannot convert from 'string' to 'ref string'
How do I call this function ?.

My statement is like this
CustomOutVal = CustObj.Authenticate(txtUserName.Text,
pass , Domain );

Regards,
Kishor