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how can I Search the database with a plus sign?
I need search to database with c# in winforms like this

You can build a string like this:
string Sql = "SELECT * FROM table1 WHERE Name LIKE 'One+tow'";
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Easy: use a parameterised query:
using (SqlConnection con = new SqlConnection(strConnect))
    using (SqlDataAdapter da = new SqlDataAdapter("SELECT MyColumn1, MyColumn2 FROM myTable WHERE mySearchColumn = @SEARCH", con))
        da.SelectCommand.Parameters.AddWithValue("@SEARCH", "one+two");
        DataTable dt = new DataTable();
        myDataGridView.DataSource = dt;
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