Getting data from DataGridView and exporting to database

Question

I cannot get my desired data from a DataGridView . It only exports the first row of data.

Database:

 acct_no | first_name | last_name  |  mid_name   
-----------------------------------------------------------
  201    | first1     | last1      |  mid1
  202    | first2     | last2      |  mid2
  203    | first3     | last3      |  mid2
-----------------------------------------------------------

But when I run my code the result is:

 acct_no | first_name | last_name  |  mid_name   
-----------------------------------------------------------
  201    | first1     | last1      |  mid1
  202    | first1     | last1      |  mid2
  203    | first1     | last1      |  mid2
-----------------------------------------------------------

It didn't loop to all rows. Here is my code:

for (int i = 0; i <= dataGridView1.Rows.Count - 1; i++)
{
    foreach (var cell in dataGridView1.Rows[i].Cells)
    { 
        command.CommandText = "INSERT INTO MEMBER (ACCT_NO, LAST_NAME, FIRST_NAME, MID_NAME) VALUES(@ACCT_NO, @LAST_NAME, @FIRST_NAME, @MID_NAME)";

        command.Parameters.AddWithValue("@ACCT_NO", dataGridView1.Rows[i].Cells[0].Value);
        command.Parameters.AddWithValue("@LAST_NAME", dataGridView1.Rows[i].Cells[1].Value);
        command.Parameters.AddWithValue("@FIRST_NAME", dataGridView1.Rows[i].Cells[2].Value);
        command.Parameters.AddWithValue("@MID_NAME", dataGridView1.Rows[i].Cells[3].Value);
    }
}

Answer 1

Problem : As I can not see your ExecuteNonQuery() statement in the loop, I suspect that you are executing the query at the end of the loop.

EDIT 1: As @AbZy suggested from comments your foreach loop does not make any sense because you are adding all cell values from the current row . So remove your foreach loop.

Assuming you are are using OleDb, I don't think OleDb supports Named Parameters . So instead of parameter names provide the question marks in your query.

Solution1: Execute the command.ExecuteNonQuery(); statement inside the loop and clear the parameters.

Just add following two statements to your code:

command.ExecuteNonQuery();
command.Parameters.Clear();

Complete Code:

for (int i = 0; i <= dataGridView1.Rows.Count - 1; i++)
{
 command.CommandText = "INSERT INTO RP_CMG01 (ACCT_NO, LAST_NAME, FIRST_NAME, 
                MID_NAME) VALUES(?, ?, ?, ?)";
 command.Parameters.AddWithValue("@ACCT_NO", dataGridView1.Rows[i].Cells[0].Value);
 command.Parameters.AddWithValue("@LAST_NAME", dataGridView1.Rows[i].Cells[1].Value);
 command.Parameters.AddWithValue("@FIRST_NAME", dataGridView1.Rows[i].Cells[2].Value);
 command.Parameters.AddWithValue("@MID_NAME", dataGridView1.Rows[i].Cells[3].Value);
 command.ExecuteNonQuery();
 command.Parameters.Clear();
}

Answer 2

Try this:

for (int i = 0; i <= dataGridView1.Rows.Count - 1; i++)
        {
            foreach (var cell in dataGridView1.Rows[i].Cells)
            { 
                command.CommandText = "INSERT INTO RP_CMG01 (ACCT_NO, LAST_NAME, FIRST_NAME, MID_NAME) VALUES(@ACCT_NO, @LAST_NAME, @FIRST_NAME, @MID_NAME)";

                command.Parameters.AddWithValue("@ACCT_NO", dataGridView1.Rows[i].Cells[0].Value);
                command.Parameters.AddWithValue("@LAST_NAME", dataGridView1.Rows[i].Cells[1].Value);
                command.Parameters.AddWithValue("@FIRST_NAME", dataGridView1.Rows[i].Cells[2].Value);
                command.Parameters.AddWithValue("@MID_NAME", dataGridView1.Rows[i].Cells[3].Value);

                command.ExecuteNoQuery();
                command.Parameters.Clear();
            }
        }