Hi Hüseyin,
Thanks for contacting Syncfusion support.
Before we proceed with your query we need the following details,
1. In this you have render the Grid with some columns and you need to add a new column in Grid .The added column should be saved to SQL Database table.
To add a new column in Grid, use columns method of ejGrid. Once we had a new column in Grid the actionComplete event will be triggered. In actionComplete event you can pass the newly added column to server-side and saved to SQL Database table.
Refer to the Help documents.
If we misunderstood your query, please get back to us with elaborating your requirement.
Regards,
Venkatesh Ayothiraman.