how to create searching in repository pattern in mvc 5

there are several way to implement repository pattern.

usually it depends on the reason you need this pattern.

for example if you need this pattern to create a common way to access different kinds of databases (sql, mysql, mongo) then you need to create a "searching" that can works in both of them.

if you need a simple wrapper over entity framework
that's the one i use :

public interface IRepository<TEntity>
 where TEntity : class
{
    int BulkInsert(System.Linq.IOrderedEnumerable<TEntity> items);
    int Delete(TEntity item);
    int DeleteRange(System.Collections.Generic.IEnumerable<TEntity> items);
    System.Collections.Generic.IEnumerable<TEntity> Get();
    TEntity Get(params object[] keys);
    System.Collections.Generic.IEnumerable<TEntity> Get(Func<tentity,bool> lambda);
    int Insert(TEntity item);
    int Update(TEntity item);
    void Dispose();
}

public abstract class BaseRepository<TContext,TEntity> : IDisposable, IRepository<TEntity>
    where TEntity : class
    where TContext : DbContext, new()
{
    public TContext Context { get; private set; }
    private DbSet<TEntity> DbSet { get { return Context.Set<TEntity>(); } }

    public BaseRepository()
    {
        Context = new TContext();
    }

    public TEntity Get(params object[] keys)
    {
        Context.Configuration.AutoDetectChangesEnabled = false;
        var e = DbSet.Find(keys);
        Context.Configuration.AutoDetectChangesEnabled = true;
        return e;
    }
    public IEnumerable<TEntity> Get()
    {
        Context.Configuration.AutoDetectChangesEnabled = false;
        var e = DbSet.ToList();
        Context.Configuration.AutoDetectChangesEnabled = true;
        return e;
    }
    public IEnumerable<TEntity> Get(Func<tentity,> lambda)
    {
        Context.Configuration.AutoDetectChangesEnabled = false;
        var e = DbSet.Where(lambda).ToList();
        Context.Configuration.AutoDetectChangesEnabled = true;
        return e;
    }
}

///
/// Instance of your entity framework context
///
public class TestRepository<TEntity> : BaseRepository<dbtest,>
    where TEntity : class
{
    public TestRepository()
        : base()
    {
    }
}

// Usage
var users = new TestRepository< User>().Get(u => u.PhoneNumber.StartsWith("00") && u.IsDeleted == 0);

note my full version implements idisposable so you can put your new TestRepository< User>() inside a using statement