How to search datagridview (stored procedure data) using textbox

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C#

Windows

form

In my Windows applicaton, I have a Datagridview and Textbox control. I'm using a stored procedure to display some data in the datagridview. The problem is when I tried to search in my datagridview, nothing happens and also it's so laggy when inputting to textbox and I discover this

CustomersList.DataSource = dt;

is the reason. I'm pretty new to using stored procedures. I hope someone would be able to help me.

What I have tried:

Datatable dt;
private void txt_usersearch_TextChanged(object sender, EventArgs e)
{
    using (var con = new SqlConnection(ConfigurationManager.ConnectionStrings["SalesInventoryManagement.Properties.Settings.Setting"].ConnectionString))
        {
            using (var cmd = new SqlCommand("usp_GetCustomers", con))
            {
                cmd.CommandType = CommandType.StoredProcedure;                   
                dt.DefaultView.RowFilter = "Full_Name LIKE '%{txt_usersearch.Text}%'";
                CustomersList.DataSource = dt;
            }
        }
}

and this code is to display my data to datagridview

public class Display 
{
    public static void Display_Customer(DataTable dt, DataGridView dgv)
    {     
        using (var con = new SqlConnection(ConfigurationManager.ConnectionStrings["SalesInventoryManagement.Properties.Settings.Setting"].ConnectionString))
        {
            using (var cmd = new SqlCommand("usp_GetCustomers", con))
            {               
                con.Open();
                cmd.CommandType = CommandType.StoredProcedure;

                using (var sda = new SqlDataAdapter(cmd))
                {                        
                    dt = new DataTable();
                    sda.Fill(dt);
                    dgv.DataSource = dt;
                }

                con.Close();
            }
        }
    }  
}
Form load

private void ManageCustomer_Load(object sender, EventArgs e)
{
        Display.Display_Customer(dt, CustomersList);
}