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

Your column doesn't seem to have type int. To avoid things like this, you can use the columnnames instead of indexes.

try
{
    SqlCeCommand com = new SqlCeCommand("select * from Category_Master", con);
    SqlCeDataReader dr = com.ExecuteReader();
    while(dr.Read()){
        string name = dr["yourColumnName"].ToString();
        cmbProductCategory.Items.Add(name);
    }
}
catch(Exception ex)
{
    System.Windows.Forms.MessageBox.Show(ex.Message, System.Windows.Forms.Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);
}