Check Constraint and DataGrid

Question

Hello evyone. I have 2 questions. 1.I need to retrieve the checkconstraints of a field in a table(MS Sql Server).A dropdown list should hold these check constraints.How do I do it with C#? 2.I need to change the Column length of a DataGrid whose columns are DataBound.How do I do it?? Thanx in advance Aravind