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();
            }
        }