[Solved] ASP.Net Error: Procedure or function has too many arguments specified

Use this code to clear the parameters before reassign new parameter value for each loop.

using (SqlCommand cmd = new SqlCommand("[Insert_DisplayDetail]", con))
{
    foreach (GridViewRow row in Gridview1.Rows)
    {
        FileUpload upload = (FileUpload)row.FindControl("FileUpload1");
        // if (!string.IsNullOrEmpty(customerName) && !string.IsNullOrEmpty(country) && !string.IsNullOrEmpty(upload.PostedFile.FileName))
        {
            System.IO.Stream fs = upload.PostedFile.InputStream;
            System.IO.BinaryReader br = new System.IO.BinaryReader(fs);
            Byte[] bytes = br.ReadBytes((Int32)fs.Length);

            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.Clear();
            cmd.Parameters.AddWithValue("@ID", _ID);

            cmd.Parameters.AddWithValue("@Data", bytes);
            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();
        }
    }
}

Or declare the SqlCommand inside the foreach loop.

foreach (GridViewRow row in Gridview1.Rows)
{
    using (SqlCommand cmd = new SqlCommand("[Insert_DisplayDetail]", con))
    {
        FileUpload upload = (FileUpload)row.FindControl("FileUpload1");
        // if (!string.IsNullOrEmpty(customerName) && !string.IsNullOrEmpty(country) && !string.IsNullOrEmpty(upload.PostedFile.FileName))
        {
            System.IO.Stream fs = upload.PostedFile.InputStream;
            System.IO.BinaryReader br = new System.IO.BinaryReader(fs);
            Byte[] bytes = br.ReadBytes((Int32)fs.Length);

            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@ID", _ID);

            cmd.Parameters.AddWithValue("@Data", bytes);
            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();
        }
    }
}