Question

How can I pass a columns name by parameter,

follow an example

DataTable dt = new DataTable();

// Here I fill my datatable

for (int i = 0; i < dt.Rows.Count; i++)
{
     for (int j = 0; j < dt.Columns.Count; j++)
     {
       string columnsname = dt.Rows[i][dt.columns[j].toString()].toString();
       SqlCommand comando = new SqlCommand();
       comando.commandText = "UPDATE Sales.Store SET @columnname = @demographics where id =   @id";
       comando.Parameters.Add(new SqlParameter("@columnname", columname));
       comando.Parameters.Add(new SqlParameter("@dados2", dados2));
       comando.ExecuteNonQuery();
       comando.Clear();
       comando.Dispose()
    } 
}

This doesn’t work, but I have 88 columns, and I need update all data in every 88 columns in each row.

Answer 1

You cannot parameterize column names.

To do what you want you will need to resort to dynamic SQL.