Hi,
You can achieve this by below ways:
Store data with dot(.) as decimal separator in database and at the time of retrieval you can convert the value into string and replace dot(.) with comma(,). For example,
string doubleValue=valueFromDatabase.ToString("0.00");
doubleValue=doubleValue.replace('.',',');
You can also use the varchar format. so you can store data with a comma(,) as decimal separator and retrieve directly from database. You can provide client side validations for accepting data in the required format.
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