Question

I have a Sql Database (which I have no control over the schema) that has a Column that will have the varchar value of “Yes”, “No”, or it will be null. For the purpose of what I am doing null will be handled as No.

I am programming in c# net 3.5 using a data table and table adapter to pull the data down. I would like to directly bind the column using a binding source to a check box I have in my program however I do not know how or where to put the logic to convert the string Yes/No/null to boolean True/False;

Reading a null from the SQL server and writing back a No on a update is acceptable behavior.

Any help is greatly appreciated.

EDIT —
This is being developed for windows.

Answer 1

I originally used Dathan’s solution however my checkbox would not push its updates to the data table it was bound to, while trying to solve that issue I found out about Binding.Parse and Binding.Format I now leave the query normal and use this:

Public Form1()
{
    InitializeComponent();
    cbxKeepWebInfinityChanges.DataBindings["Checked"].Parse += new ConvertEventHandler(cbxKeepWebInfinityChanges_Parse);
    cbxKeepWebInfinityChanges.DataBindings["Checked"].Format += new ConvertEventHandler(cbxKeepWebInfinityChanges_Format);
}

void cbxKeepWebInfinityChanges_Parse(object sender, ConvertEventArgs e)
{
    if ((bool)e.Value == true)
        e.Value = "Yes";
    else
        e.Value = "No";
}
void cbxKeepWebInfinityChanges_Format(object sender, ConvertEventArgs e)
{
    if ((string)e.Value == "Yes")
        e.Value = true;
    else
        e.Value = false;
}