Data type mismatch in criteria expression

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i am creating an app in c# using window form. i want to read data from access database using datareader. here is the code.:

C#

conn.Open();
string CommandText = "SELECT * FROM entry where userid ='"+ userid.Text + "'";
           OleDbCommand cmd = new OleDbCommand(CommandText);
           cmd.Connection = conn;
           OleDbDataReader dr;
            dr = cmd.ExecuteReader();
            while (dr.Read())
            {
                panel1.Visible = true;
                label13.Text = dr["userid"].ToString();
                label13.Text = dr["Name"].ToString();
                label13.Text = dr["NIC"].ToString();
                label13.Text = dr["Father_Name"].ToString();
             }

i got the following error:

Data type mismatch in criteria expression
please help me out this error.

thanks in advance

Posted 2-Jul-12 23:45pm

saifullahiit

Updated 2-Jul-12 23:47pm

Mehdi Gholam

v2

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2 solutions

Solution 2

string CommandText = "SELECT * FROM entry where userid ='"+ userid.Text + "'";

check userid column datatype is int.
If it is change above sentence to

string CommandText = "SELECT * FROM entry where userid ="+ Convert.TOInt32(userid.Text) + "";

Posted 3-Jul-12 0:09am

pradiprenushe

Comments

Matt T Heffron 12-Apr-13 13:19pm

You're converting the userid.Text to Int32 and then immediately converting it back to string when concatenating the strings??

If the .Text is not the string representation of an integer, then your code will throw a FormatException.

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Raghunatha_Reddy_S · Accepted Answer · 2012-07-02T23:54:00

If user id is an integer then try this

conn.Open();
string CommandText = "SELECT * FROM entry where userid ="+ userid.Text ;
           OleDbCommand cmd = new OleDbCommand(CommandText);
           cmd.Connection = conn;
           OleDbDataReader dr;
            dr = cmd.ExecuteReader();
            while (dr.Read())
            {
                panel1.Visible = true;
                label13.Text = Convert.ToString(dr["userid"]);
                label13.Text = Convert.ToString(dr["Name"]);
                label13.Text = Convert.ToString(dr["NIC"]);
                label13.Text = Convert.ToString(dr["Father_Name"]);
             }