C# – How to hide a specific column form a dataGridView

From an int:

YourEnum foo = (YourEnum)yourInt;

From a string:

YourEnum foo = (YourEnum) Enum.Parse(typeof(YourEnum), yourString);

// The foo.ToString().Contains(",") check is necessary for enumerations marked with an [Flags] attribute
if (!Enum.IsDefined(typeof(YourEnum), foo) && !foo.ToString().Contains(","))
{
    throw new InvalidOperationException($"{yourString} is not an underlying value of the YourEnum enumeration.")
}

Update:

From number you can also

YourEnum foo = (YourEnum)Enum.ToObject(typeof(YourEnum) , yourInt);

Don't you just want to remove the inner foreach loop? Or have I missed something?

foreach (DataGridViewRow row in this.dataGridView2.Rows)
{                            
    DataGridViewCell cell = row.Cells[2]; //Note specified column index
    if (cell.Value == null || cell.Value.Equals(""))
    {
        continue;
    }

    GetQuestions(cell.Value.ToString());
}