How do I restrict user to enter exactly 5 input in DataGridView using C#

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I want to take input of exactly 5 records from user at runtime and show it in datagridview can anybody know how to restrict user for this? a message will generated on try for entering 6th record. following is my code where I entered records in datagridview.

C#

//button add data to dataGridView
        //insert image from pictureBox to dataGridView
        private void btn_Add_Click(object sender, EventArgs e)
        {
            MemoryStream ms = new MemoryStream();
            pictureBox1.Image.Save(ms, pictureBox1.Image.RawFormat);
            byte[] img = ms.ToArray();
            dataGridView1.Rows.Add(txt_UserID.Text, txt_Name.Text, img);
        }

Posted 17-May-15 2:47am

Member 11657542

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Kornfeld Eliyahu Peter · Answer 1 · 2015-05-17T02:59:00

Solution 1

You can check DataGridView.RowCount[^] or DataGridView.Rows.Count[^] before adding a new row and show a message if you already got 5...

Posted 17-May-15 2:59am

Kornfeld Eliyahu Peter

Comments

Member 11657542 17-May-15 10:37am

Thanks it works!

Sergey Alexandrovich Kryukov 17-May-15 10:44am

Not quite. Please see my comment to "Solution 3".

Peter,

You would need to explain what events would you need to subscribe to to detect adding a row.

See also alternative Solution 2.

—SA

Sergey Alexandrovich Kryukov · Answer 2 · 2015-05-17T04:40:00

Alternatively to Solution 1, you can pre-create DataGridView instance with exactly 5 rows, which can be left empty in some cell, requiring user's input in it.

This is the Boolean property which allows the user to add a row: https://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview.allowusertoaddrows%28v=vs.110%29.aspx[^].

It is true by default, and you would need to change its value to false.

—SA

Member 11657542 · Answer 3 · 2015-05-17T04:38:00

Solution 2

C#

 private void btn_Add_Click(object sender, EventArgs e)
{
int numberOfRows = dataGridView1.Rows.Count;
if (numberOfRows < 5)
{
    MemoryStream ms = new MemoryStream();
    pictureBox1.Image.Save(ms, pictureBox1.Image.RawFormat);
    byte[] img = ms.ToArray();
    dataGridView1.Rows.Add(txt_UserID.Text, txt_Name.Text, img);
}
    else
{
    MessageBox.Show("Please insert Only 5 Images");
}

}

Posted 17-May-15 4:38am

Member 11657542

Updated 17-May-15 4:40am

v2

Comments

Sergey Alexandrovich Kryukov 17-May-15 10:42am

This is if you use some button. But the new row can be added by entering data in the very last row which is the mechanism for adding rows. How are you going to limit it?
—SA

Member 11657542 17-May-15 11:01am

when user try to enter 6th record he can't because a messagebox will generated.

Sergey Alexandrovich Kryukov 17-May-15 11:16am

No, because it can be done without pressing your button.
—SA

Sergey Alexandrovich Kryukov 17-May-15 10:43am

And this is not an answer. You just used Solution 1. And how you could accept your own "solution" formally?
This is the abuse.
—SA

Member 11657542 · Answer 4 · 2015-05-17T05:34:00

see my code is working as I want to do, and I have taken idea from your suggestion to use "RowCount".

C#

        //button add data to dataGridView
        //insert image from pictureBox to dataGridView
        private void btn_Add_Click(object sender, EventArgs e)
        {
            int numberOfRows = dataGridView1.Rows.Count;
            if (numberOfRows < 5)
            {
                MemoryStream ms = new MemoryStream();
                pictureBox1.Image.Save(ms, pictureBox1.Image.RawFormat);
                byte[] img = ms.ToArray();
                dataGridView1.Rows.Add(txt_UserID.Text, txt_Name.Text, img);
            }
                else
            {
                MessageBox.Show("Please insert Only 5 Images");
            }

            }

private void btn_Save_Click(object sender, EventArgs e)
        {
            int numberOfRows = dataGridView1.Rows.Count;
            if (numberOfRows == 5)
            {

                for (int i = 0; i < dataGridView1.Rows.Count; i++)
                {
                    string col1 = dataGridView1.Rows[i].Cells[0].Value.ToString();
                    string col2 = dataGridView1.Rows[i].Cells[1].Value.ToString();
                    string col3 = dataGridView1.Rows[i].Cells[2].Value.ToString();
                    string insert_sql = "INSERT INTO Input(UserID, UserName, PassImage) VALUES ('" + col1 + "','" + col2 + "','" + col3 + "')";
                    this.getcom(insert_sql);
                }

                MessageBox.Show("Record Added");

            }
            else
            {
                MessageBox.Show("Please Enter 5 Images");
            }

         }