How to Search data in DataGridView

private void Search_Click(object sender, EventArgs e)
        {
            DataTable dtTemp;
            dtTemp = dtSource.Clone();


            for (int i = 0; i < dtSource.Rows.Count; i++)
            {
                if (MatchWildcardString(textBox1.Text,dtSource.Rows[i].ItemArray[0].ToString()))
                {
                    dtTemp.ImportRow(dtSource.Rows[i]);
                }
            }

            dataGridView1.DataSource = dtTemp;
            String x = dataGridView1.RowCount.ToString();

        }

        public Boolean MatchWildcardString(String pattern, String input)
        {
            if (String.Compare(pattern, input) == 0)
            {
                return true;
            }
            else if (String.IsNullOrEmpty(input))
            {
                if (String.IsNullOrEmpty(pattern.Trim(new Char[1] { '*' })))
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            else if (pattern.Length == 0)
            {
                return false;
            }
            else if (pattern[0] == '?')
            {
                return MatchWildcardString(pattern.Substring(1), input.Substring(1));
            }
            else if (pattern[pattern.Length - 1] == '?')
            {
                return MatchWildcardString(pattern.Substring(0, pattern.Length - 1), input.Substring(0, input.Length - 1));
            }
            else if (pattern[0] == '*')
            {
                if (MatchWildcardString(pattern.Substring(1), input))
                {
                    return true;
                }
                else
                {
                    return MatchWildcardString(pattern, input.Substring(1));
                }
            }
            else if (pattern[pattern.Length - 1] == '*')
            {
                if (MatchWildcardString(pattern.Substring(0, pattern.Length - 1), input))
                {
                    return true;
                }
                else
                {
                    return MatchWildcardString(pattern, input.Substring(0, input.Length - 1));
                }
            }
            else if (pattern[0] == input[0])
            {
                return MatchWildcardString(pattern.Substring(1), input.Substring(1));
            }
            return false;
        }