Hello,

Thanks for your post.

I performed a test on my side. I tried the following code, but I cannot reproduce the issue on my machine.

        DataTable dt = new DataTable();

        private void CellClickTest_Load(object sender, EventArgs e)
        {
            dt.Columns.Add("name");
            dt.Columns.Add("price", typeof(decimal));
            dt.Columns.Add("volume", typeof(int));
            dt.Rows.Add("item1", 1.25, 3);
            dt.Rows.Add("item2", 2.25, 8);
            dt.Rows.Add("item3", 4.25, 6);
            dt.AcceptChanges();

            this.dataGridView1.DataSource = dt;

            DataGridViewButtonColumn bc = new DataGridViewButtonColumn();
            bc.HeaderText = " ";
            bc.Text = "Add";
            this.dataGridView1.Columns.Add(bc);

            this.dataGridView1.CellClick += new DataGridViewCellEventHandler(dataGridView1_CellClick);
        }

        int count = 0;

        void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            if (e.RowIndex >= 0 && e.ColumnIndex == 3)
            {
                count++;
                this.lblcount.Text = count.ToString();
            }
        }

There must be something wrong in the other code rather than the CellClick event handler, please make sure that you didn't register the event twice. Could you please send me a simple sample that can reproduce this issue to my mail box[v-rzhang[at]microsoft.com]? I will perform test on my side and keep you updated.

Thanks,
Rong-Chun Zhang
MSDN Subscriber Support in Forum
If you have any feedback on our support, please contact msdnmg[at]microsoft.com

Hello,

Thanks for your post.

I performed a test on my side. I tried the following code, but I cannot reproduce the issue on my machine.

        DataTable dt = new DataTable();

        private void CellClickTest_Load(object sender, EventArgs e)
        {
            dt.Columns.Add("name");
            dt.Columns.Add("price", typeof(decimal));
            dt.Columns.Add("volume", typeof(int));
            dt.Rows.Add("item1", 1.25, 3);
            dt.Rows.Add("item2", 2.25, 8);
            dt.Rows.Add("item3", 4.25, 6);
            dt.AcceptChanges();

            this.dataGridView1.DataSource = dt;

            DataGridViewButtonColumn bc = new DataGridViewButtonColumn();
            bc.HeaderText = " ";
            bc.Text = "Add";
            this.dataGridView1.Columns.Add(bc);

            this.dataGridView1.CellClick += new DataGridViewCellEventHandler(dataGridView1_CellClick);
        }

        int count = 0;

        void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            if (e.RowIndex >= 0 && e.ColumnIndex == 3)
            {
                count++;
                this.lblcount.Text = count.ToString();
            }
        }

There must be something wrong in the other code rather than the CellClick event handler, please make sure that you didn't register the event twice. Could you please send me a simple sample that can reproduce this issue to my mail box[v-rzhang[at]microsoft.com]? I will perform test on my side and keep you updated.

Thanks,
Rong-Chun Zhang
MSDN Subscriber Support in Forum
If you have any feedback on our support, please contact msdnmg[at]microsoft.com