Sql stored procedure passing array

@ChannelType int,
@ChannelStatus	int,
@govId int,
@DistId int,
@Budget money,
@dt varchar(max),
@minSqm int,
@maxSqm int

USE [Tenant Management]
GO
/****** Object:  StoredProcedure [dbo].[BuySearchEngine]    Script Date: 8/31/2018 4:22:27 PM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[BuySearchEngine]
@ChannelType int,
@ChannelStatus	int,
@govId int,
@DistId int,
@Budget money,
@dt varchar(max),
@minSqm int,
@maxSqm int

AS
select DISTINCT  c.ID,c.Name,cc.[Channel Category], gv.GOVERNATOR + ' '+dst.District+' '+ct.City +' '+c.street As Location,c.Surface
,c.Floor,c.[Selling Price],c.[Market price] 
from [dbo].[Channel_availableSpecs] asp
inner join [dbo].[Channel] c on asp.Channel_Id = c.ID 
inner join [dbo].[Channel_Category] cc on c.[Channel Category ID] = cc.ID
inner join [dbo].[Governator] gv on c.[Governator ID] = gv.ID
inner join [dbo].[District] dst on c.[District ID] = dst.id
inner join [dbo].[City] ct on c.[City ID] = ct.id
where  c.[Channel Type] =@ChannelType
   and c.[Channel Status]=@ChannelStatus
   and c.[Governator ID]=@govId
   and c.[District ID]=@DistId
   and c.[Selling Price] < @Budget
   and c.Surface >= @minSqm
   and c.Surface <= @maxSqm
   and asp.ChennelSpec_Id IN (SELECT asp.ChennelSpec_Id FROM  Fn_split(@dt, ','))

       List<string> list = new List<string>();
 private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)
       {
           list.Add(checkedListBox1.SelectedValue.ToString());


       }

private void next_Click(object sender, EventArgs e)
       {   int govId,distId,minSqm,maxSqm;
           Int32.TryParse(governator.SelectedValue?.ToString(),out govId);
           Int32.TryParse(district.SelectedValue?.ToString(),out distId);
           Int32.TryParse(sqm_from.Text,out minSqm);
           Int32.TryParse(sqm_to.Text,out maxSqm);

           if (rentbutton == 1)
           {
               rent_panel.Show();

           }
           else
           {
               buy_search_panel.Show();
               string[] Specs = new string[list.Count];
               Utilities.BuySearch(Specs, govId, distId, minSqm,maxSqm,availability);
               list.Clear();
           }
           availabilityFill();
       }






 public static void BuySearch(Array array,int govId,int distId, int minSqm,int maxSqm,DataGridView dataGridView)
       {
             string specs = Get_comma_delimited_string(array);
             SqlConnection conn = new SqlConnection(ConnectionString);
             SqlCommand cmd = conn.CreateCommand();

           cmd.CommandText = "Execute BuySearchEngine @ChannelType, @ChannelStatus, @govId, @DistId, @Budget, @dt";
           cmd.Parameters.Add("@ChannelType", SqlDbType.Int).Value = "1";
           cmd.Parameters.Add("@ChannelStatus", SqlDbType.Int).Value ="5" ;
           cmd.Parameters.Add("@govId", SqlDbType.Int).Value = govId;
           cmd.Parameters.Add("@DistId", SqlDbType.Int).Value = distId;
           cmd.Parameters.Add("@dt", SqlDbType.VarChar).Value = specs;
           cmd.Parameters.Add("@minSqm", SqlDbType.Int).Value = minSqm;
           cmd.Parameters.Add("@maxSqm", SqlDbType.Int).Value = maxSqm;
           conn.Open();
           DataTable dt = new DataTable();
           cmd.CommandType = CommandType.StoredProcedure;
           SqlDataAdapter da = new SqlDataAdapter(cmd);
           da.Fill(dt);
           dataGridView.DataSource = dt;
           conn.Close();

       }