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Код

BindingSource bs = new BindingSource();
            bs.DataSource = this.usersDataGridView.Columns["Фамилия"];
            try
            {
              
               
               // StrP string = this.textBox9.Text;
                if (this.textBox9.Text == "")
                {
                    bs.Filter = string.Format("Фамилия = '{0}' + '%'", this.textBox9.Text);
                    if (bs.Count == 0)  
                    {
                        MessageBox.Show("Записей с данной маской нет!");

                        this.textBox9.Select();
                        this.textBox9.Text = string.Empty;
                        bs.Filter = string.Empty;
                        return;

                    }
                }
                else
                {
                    MessageBox.Show("Введите маску для поиска!");
                }
                this.textBox9.Text = string.Empty;
            }

            catch (Exception ex)
            {
                MessageBox.Show(ex.Message + "\n" + ex.StackTrace);
            }