Answer:
We have to follow 4 steps for populating dropdownlist.
1st step:Attach datasource to dataset.
ddl_project.DataSource = ds_project.
2nd step:assign datatextfield property to column name
ddl_project.DataTextField = "project_name";
3rd step:assign datavaluefield property to column name
ddl_project.DataValueField = "project_id";
4th step:call databind method
ddl_project.DataBind();
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