Error in DropDownList using ASP.NET

I have a DropDownList called (DDL) in ASP.net page, I want that DDL contains some records of a table in the data base.

So I did this :

DDL.DataSource = myDataReader

DDL.DataBind()

But it's givi开发者_StackOverflowng me (5 records) "the number of records of the table" but like this :

System.Data.Common.DataRecordInternel
System.Data.Common.DataRecordInternel
System.Data.Common.DataRecordInternel
System.Data.Common.DataRecordInternel
System.Data.Common.DataRecordInternel

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You should set DataTextField and DataValueField, otherwise data binding will perform .ToString() on every row and put it as item:

DDL.DataSource = myDataReader;
DDL.DataTextField = "[Text column name]";
DDL.DataValueField = "[Value column name]";
DDL.DataBind();

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you have to set the text and the key fields of the ddl before you databind

DDL.DataTextField = "textColumn";
DDL.DataValueField = "textColumn":

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The code : ddl.datasource=reader is just setting the content present in reader (array of columns of table) as the main source of data.
Now as ddl show only a single column in it so u need to write a piece of code which tells ddl that which column it has to display.
So you will write: ddl.textfield="column name which you want to show"; and ddl.valuefield="column name which you want as a reference to pass to database";