Data source is an invalid type

Question

i got error as  Data source is an invalid type. It must be either an IListSource, IEnumerable, or IDataSource.   BL b = new BL(); protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e) { string X = Convert.ToString(e.CommandArgument); int index = Convert.ToInt32(X); GridViewRow row = (GridViewRow)GridView1.Rows[index]; Label id = (Label)row.FindControl("lbl1"); int artid = Convert.ToInt32(id.Text); GridView1.DataSource =b.DeleteProList(artid); GridView1.DataBind(); }    DAL: public int DeleteProList(int proId) { con.Open(); SqlCommand cmd = new SqlCommand("sp_deleteProjectList", con); cmd.CommandType = CommandType.StoredProcedure; cmd.Parameters.AddWithValue("@ProjectId", proId); SqlDataAdapter da = new SqlDataAdapter(cmd); DataSet ds = new DataSet(); da.Fill(ds); int i = Convert.ToInt32(cmd.ExecuteNonQuery()); return i; }   BL: public int DeleteProList(int proId) { return d.DeleteProList(proId); }

Rajkiran Swain · Answer

You are returning a single object from DeleteProList  method and binding that to the GridView1 , thats why it is giving error.

Amit Gupta · Answer

Hey   Could you elaborate your program scenario, what you want to achieve?   As method seems it was for deleting purpose, and you are using it as a DataSource.   DataSource cannot be an integer value, it must be a collection.   Do check all the silly mistakes and it will resolve your issue