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In this article we can see how to find exiting email id from data base and it will display error message if it already exits
We created a method with name uniqueEmail.
Established a connection to the database.
Getting the data from the table aspnet_Membership.
Using the ExecuteReader to read the values and checking the condition weather email id is already exists or not.
if (uniqueEmail())
{
Insert Code logic //
or
Update Code Logic
}
Output:
We created a method with name uniqueEmail.
Established a connection to the database.
Getting the data from the table aspnet_Membership.
Using the ExecuteReader to read the values and checking the condition weather email id is already exists or not.
public bool uniqueEmail() { string iemail; string constr = ABCDataAccessLayer.ABCConnctionString; // connection string SqlConnection con = new SqlConnection(constr); con.Open(); string query = "select count(Email) as Email from aspnet_Membership where Email= '" + txtEmailID.Text + "'"; SqlCommand cmd = new SqlCommand(query, con); SqlDataReader dr; dr = cmd.ExecuteReader(); while (dr.Read()) { iemail = dr["Email"].ToString(); if (iemail != "0") { mailerror.Text = "Enter different email id"; return false; } } return true; }Keep if condition,if you want to check email in insert mode or update mode
if (uniqueEmail())
{
Insert Code logic //
or
Update Code Logic
}
Output:
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In ASP.NET, you can check if an email address already exists in the database by executing a query to search for the email address Here. You can use SQL queries or Entity Framework to perform this task efficiently. Remember to handle potential exceptions and sanitize user input to ensure security.
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