storing checkbox rsponse in bit and binary

[jay patel]

Hello

I have created one page in C#.net and there I have kept 6 different checkboxes to select option and then I want to convert this response into binary and want to store in binary format to database. so, how could I?
I have already stored it in string as below but I want to store it in binary format so, any one can say me?

StringBuilder Selection1 = new StringBuilder();
    
                foreach (ListItem item in Checkbox_c1.Items)
                {
                    if (item.Selected)
                        Selection1.Append("1");
                    else
                        Selection1.Append("0");
                }
     string cmbn1sequn = Selection1.ToString();

but now I wanted to store it in binary format. so, how?

and other question is that how should I have to write in sql query to store bit in database?