如何创建sql临时表并使用sql命令（C＃）将数据插入到其中

Question

我确定了一个包含gridview的c#表单。 我想在按钮单击时将选定的行数据插入到临时表中。 我已经尝试过了，但是没有用。 它显示错误：

字符串或二进制数据将被截断。 该语句已终止

下面是我的代码：

private void button1_Click(object sender, EventArgs e)
    { 
        int i = 0;
        List<int> ChkedRow = new List<int>();

        for (i = 0; i <= dataGridView1.RowCount - 1; i++)
        {
            if (Convert.ToBoolean(dataGridView1.Rows[i].Cells["Column1"].Value) == true)
            {
                ChkedRow.Add(i);
            }
        }

        if (ChkedRow.Count == 0)
        {
            MessageBox.Show("Select Items to view report");
            return;
        }

        foreach (int j in ChkedRow)
        {
            String ConnectionString1 = @"Data Source=.\SQLEXPRESS;Initial Catalog=tempdb;Integrated Security=True;Pooling=False";

            cnnStr = @"create table ##gridtemp (itmcod varchar(7)) INSERT INTO ##gridtemp (itmcod)
                        VALUES ('" + dataGridView1.Rows[j].Cells["title"].Value.ToString() + "');";

            try
            {
                using (SqlConnection cs = new SqlConnection(ConnectionString1))
                {

                    using (cmd = new SqlCommand(cnnStr, cs))
                    {
                        cs.Open();
                        cmd.ExecuteNonQuery();
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
        MessageBox.Show("Records Added Succesfully");
    }

Answer 1

    private void button1_Click(object sender, EventArgs e)
    {
        SqlConnection conn1 = new SqlConnection(@"Data Source=.\sqlexpress;Initial Catalog=tempdb;Integrated Security=True");
        SqlCommand cmd1 = new SqlCommand("create table ##gridtemp (itmcod varchar(MAX))", conn1);
        conn1.Open();
        cmd1.ExecuteNonQuery();
        DataTable dts = new DataTable();
        SqlBulkCopy bulkCopy = new SqlBulkCopy(conn1);
        bulkCopy.DestinationTableName = "##gridtemp";
        bulkCopy.WriteToServer(dts);
        conn1.Close();

        int i = 0;
        List<int> ChkedRow = new List<int>();

        for (i = 0; i <= dataGridView1.RowCount - 1; i++)
        {
            if (Convert.ToBoolean(dataGridView1.Rows[i].Cells["Column1"].Value) == true)
            {
                ChkedRow.Add(i);
            }
        }

        if (ChkedRow.Count == 0)
        {
            MessageBox.Show("Select Items to view report");
            return;
        }

        foreach (int j in ChkedRow)
        {
            String ConnectionString1 = @"Data Source=.\SQLEXPRESS;Initial Catalog=tempdb;Integrated Security=True;Pooling=False";

            cnnStr = @"INSERT INTO ##gridtemp (itmcod)
                        VALUES ('" + dataGridView1.Rows[j].Cells["itmcod"].Value.ToString() + "');";

            try
            {
                using (SqlConnection cs = new SqlConnection(ConnectionString1))
                {

                    using (cmd = new SqlCommand(cnnStr, cs))
                    {
                        cs.Open();
                        cmd.ExecuteNonQuery();
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
        MessageBox.Show("Records Added Succesfully");
    }
}