转换失败

问题描述

  SqlCommand delcmd = new SqlCommand（）;

                         delcmd.CommandText =" DELETE FROM add_investor WHERE investor_cnic =" + dataGridView1.SelectedRows [0] .Cells [0] .Value.ToString（）
+"" ;;

                         my.Open（）;&
                         delcmd.Connection = my;

                         delcmd.ExecuteNonQuery（）;

                         my.Close（）;

                         dataGridView1.Rows.RemoveAt（dataGridView1.SelectedRows [0] .Index）;

                         my.Close（）;

 SqlCommand delcmd = new SqlCommand();
                        delcmd.CommandText = "DELETE FROM add_investor WHERE investor_cnic=" + dataGridView1.SelectedRows[0].Cells[0].Value.ToString() + "";
                        my.Open();
                        delcmd.Connection = my;
                        delcmd.ExecuteNonQuery();
                        my.Close();
                        dataGridView1.Rows.RemoveAt(dataGridView1.SelectedRows[0].Index);
                        my.Close();

将nvarchar值'34101-1212121-1'转换为数据类型int时转换失败。

Conversion failed when converting the nvarchar value '34101-1212121-1' to data type int.

什么是错的

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