Cannot select multiple items in Dropdownlist error in ASP.NET during findbytext use

In this Use the following code:

ddlLearningCentre.SelectedIndex = -1; // use this before to correct this error
ddlLearningCentre.Items.FindByText(vdt.Rows[0]["enquirylccode"].ToString()).Selected = true;

Done

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show image in asp.net form from database

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