change date format in dataset

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C#2.0

C#

Hi developers,

I have a csv file that is loaded in datagridview by using dataset.
The problem is:

I want to change dates format in dataset not in datagridview before loading a csv file in datagridview

public static DataSet GetDataset(string filename)
        {
            string Connectionstring = string.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties=Text;",
            Path.GetDirectoryName(filename));
            string cmdstring = string.Format(@"SELECT *FROM {0}", Path.GetFileName(filename));
           string cmdstring1 = string.Format(@" select convert(varchar, getdate(), 103  From {0}") ,(YourFieldPath.GetFileName(filename));
            DataSet dataset = new DataSet();
          
            using (OleDbConnection olconn = new OleDbConnection(Connectionstring))
            {
                olconn.Open();
                OleDbDataAdapter adapter = new OleDbDataAdapter();
                adapter.SelectCommand = new OleDbCommand(cmdstring, olconn);
                adapter.SelectCommand = new OleDbCommand(cmdstring1, olconn);
                adapter.Fill(dataset, "Test");
                olconn.Close();               
            }
          return dataset;
        }

but when I write a code like this

select convert(varchar, getdate(), 103 From{0})

an error is raised: "Invalid argument"

A main problem is that dateformat change in multiple columns
not single or more dates are split into multiple rows and columns
so I do not know how more columns are changed.

I want to change all of the columns rows dates in dataset, by using this sql query.