As title suggested I have added an existing form to my project named Payroll but before I added it to Payroll I renamed the form to frmMain from Form1 and I changed it's name from it's original project Samp Prog while changing it's name it asked me if I would like to change everything related to the said file Form1 including the .cs and .designer.cs but every time I call frmMain in any other forms exisisting in Payroll it does not show in the suggestions.
Check that both have the same namespace, or that you are calling it with the whole namespace