Dear Experts, I have created a DLL in C#.net, which contains a method as RepeatString with single argument. and i called this function in TDL function as like below L02: SET : Result : $$CallDllFunction:TallyDLL:RepeatString:"Hello World" but this function is not calling or working ,i couldn't able to find where the problem is. may be its in TDL or DLL , here by i have attached the file in .txt format, if anybody knows about this issue please let me know.. [Note : after download the attachment , please the change the Extension as .dll (TallyDLL.dll)]