How to use List directly without convert code to data table csharp ?

I work on asp.net core .I face issue i can't use List dirctly without convert to datatable

so How to use this code based on list without convert to datatable 

var BranchesList = _OsuBranch.GetList(x => x.BRTYPE =="BR" && x.OSU_Is_Active == "Y");
              
DataTable dsBranchs = ConvertListToDataTable(BranchesList);
if (dsBranchs.Rows.Count > 0)
{
    foreach (DataRow br in dsBranchs.Rows)
    {
        strBranch = _OsuBranch.GetFirst(x => x.brcode == Convert.ToString(br["brcode"])).brcode.ToString();  //Convert.ToString(br["brcode"]).Trim();
        AppID = _OsuBranch.GetFirst(x => x.brcode == strBranch).AppID.ToString(); 
    }
}
public virtual List GetList(Expression> where)
{
    return dbSet.Where(where).ToList();

}
public partial class OsuBranch
{
    [Key]
    public string brcode { get; set; }
    public string AppID { get; set; }
    
    public string jbrcode { get; set; }

    public string BRTYPE { get; set; }

    public string JSubUnit { get; set; }

    public string DeptNo { get; set; }

    public string OSU_Is_Active { get; set; }
}

so How to use dirct list BranchesList and loop within it and assign strBranch and AppId