Datagridview to MYSQL, think int is my problem

Can I get a little help with my insert statement. This is going to MYSQL. PageNumber and SlotPosition are both (int) which is why I think its failing.

 

 

But if I do 

 

+ Convert.ToInt32(dataGridView2.Rows[i].Cells["PageNumber"].Value) + "','"

 

the other fields become Null. 

 

String cmdText = "INSERT INTO merchantitem (MerchantItem_ID, ItemListID, ItemTemplateID, PageNumber, SlotPosition) VALUES ('"

+ dataGridView2.Rows[i].Cells["MerchantItem_ID"].Value + "','"

+ dataGridView2.Rows[i].Cells["ItemListID"].Value + "','"

+ dataGridView2.Rows[i].Cells["ItemTemplateID"].Value + "','"

+ dataGridView2.Rows[i].Cells["PageNumber"].Value + "','"

+ dataGridView2.Rows[i].Cells["SlotPosition"].Value + "')";

MySqlCommand cmd = new MySqlCommand(cmdText, constr);

cmd.ExecuteNonQuery();