Unable to cast object of type 'System.Int32' to type 'System.String' in DataReader.GetString()

Question

I was trying to add data from a database to acombobox.

        try
        {
            SqlCeCommand com = new SqlCeCommand(\"select * from Category_Master\         


        

Answer 1

Use Column name in your query then specify that column name into the reader.

SqlCeCommand com = new SqlCeCommand("select catg from Category_Master", con);
                SqlCeDataReader dr = com.ExecuteReader();
                while(dr.Read()){
                    string name = dr("catg").ToString();
                    cmbProductCategory.Items.Add(name);
                }