I am programmatically creating a LLBLGenProDataSource2 and dynamically setting the EntityFactoryTypeName based on a tablename picked from a dropdownlistbox. After creating this datasource, then I bind it to a Gridview. This code works great. Now, I would like to determine what is the primary key fields of the Entity in the datasource. My code is below:

String SPTN = "";
                Array PTN = this.DDLBCodeTables.SelectedValue.Split('_');
                foreach (string nm in PTN)
                {
                    string TableName;
                    string FirstLetter = nm.Substring(0, 1);
                    TableName = FirstLetter.ToUpper() + nm.Substring(1);
                    SPTN = SPTN + TableName;
                }

                string EFTN = "DBASupport.LLBL.DAL.FactoryClasses." + SPTN + "EntityFactory, DBASupport.LLBL.DAL";
                datasource = new LLBLGenProDataSource2();
                datasource.ID = "ODSRuntime";
                datasource.DataContainerType = DataSourceDataContainerType.EntityCollection;
                datasource.AdapterTypeName = "DBASupport.LLBL.DAL.DatabaseSpecific.DataAccessAdapter, DBASupport.LLBL.DALDBSpecific";
                datasource.EntityFactoryTypeName = EFTN;
                PHCodeTable.Controls.Clear();
                GVCodeTable = new GridView();
                GVCodeTable.EnableViewState=true;
                GVCodeTable.AutoGenerateColumns=true;
                GVCodeTable.AutoGenerateSelectButton = true;
                GVCodeTable.DataSource = datasource;
                PHCodeTable.Controls.Add(GVCodeTable);
                GVCodeTable.DataBind();

Any ideas how to get the primary key from the datasource?

Thanks....

Using the entityFactory, you can create an instance of the entity and you can loop through its Fields collection to check for each EntityField's IsPrimaryKey flag.