How to link the .dll to my main program in MFC dialogue base application

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C++

I have created the dll in MFC named as CalcDLL. I have added the add class to that dll project in that i have written the code for mathematical operations like add,subtract,multiplication,division.
After I have created the new project with dialogue based MFC application. In that for calling i have added the code for addition.
For adding CalcDLL.dll to that main project in project menu -> properties->configuration properties->linker->input->additional dependencies i have added the dll path. But it is showing
Error 1 error LNK1107: invalid or corrupt file: cannot read at 0x328
How to resolve this error can anyone explain to me and i need to use only with .dll not with adding .lib

What I have tried:

In main project:
void CCalciMainDlg::OnBnClickedAdd()
{

CAdd a;
Num1 = GetDlgItemInt(IDC_EDIT_NUM1);
Num2 = GetDlgItemInt(IDC_EDIT_NUM2);
int opt = 1;
Output = a.operation(Num1, Num2,opt);

SetDlgItemInt(IDC_EDIT_OUTPUT, Output);
}

In Dll project:CalcDLL
ADD Class:Add.cpp

int CAdd::operation(int nNum1, int nNum2,int opt)
{
int result;
switch (opt)
{
case 1:
result = nNum1 + nNum2;
break;
case 2:
result = nNum1 - nNum2;
break;
case 3:
result = nNum1 * nNum2;
break;
case 4:
result = nNum1 / nNum2;
break;
}
return result;
}