Fill Dataset value into DataGridView cell in ADO.NET

Question

Sir,

 

I am in the function of fetching dataset value into a cell in DataGridView in ADO.NET.

 

I am getting a error in the function i wrote to fetch data. Here the screenshot:-

 

 

 

 

dgvtxtAddProduct is the comboBox cell. If this is wrong, how can i fetch data into DataGridView ComboBox Cell?

 

 

Here the MS SQL Query:-